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Finding the Fourth Proportional to 1,368.13, 1,888.17 and 778.57

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Solution

The fourth proportional to 1,368.13, 1,888.17 and 778.57 is: 1,074.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,368.13 : 1,888.17 = 778.57 : x
  2. Step 2: Convert to fraction form
    1,368.13/1,888.17 = 778.57/x
  3. Step 3: Cross multiply
    1,368.13x = 1,888.17 × 778.57
  4. Step 4: Simplify right side
    1,368.13x = 1,470,072.52
  5. Step 5: Solve for x
    x = 1,470,072.52/1,368.13
  6. Step 6: Final answer
    x = 1,074.51

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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.