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Finding the Fourth Proportional to 1,368.18, 1,888.20 and 778.75

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Solution

The fourth proportional to 1,368.18, 1,888.20 and 778.75 is: 1,074.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,368.18 : 1,888.20 = 778.75 : x
  2. Step 2: Convert to fraction form
    1,368.18/1,888.20 = 778.75/x
  3. Step 3: Cross multiply
    1,368.18x = 1,888.20 × 778.75
  4. Step 4: Simplify right side
    1,368.18x = 1,470,435.75
  5. Step 5: Solve for x
    x = 1,470,435.75/1,368.18
  6. Step 6: Final answer
    x = 1,074.74

Related Problems

Find fourth proportional to 684.09, 944.10 and 389.38
Half scale
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Double scale
Find fourth proportional to 1,369.18, 1,889.58 and 779.75
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.