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Finding the Fourth Proportional to 1,034.75, 1,427.96 and 642.10

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Solution

The fourth proportional to 1,034.75, 1,427.96 and 642.10 is: 886.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,034.75 : 1,427.96 = 642.10 : x
  2. Step 2: Convert to fraction form
    1,034.75/1,427.96 = 642.10/x
  3. Step 3: Cross multiply
    1,034.75x = 1,427.96 × 642.10
  4. Step 4: Simplify right side
    1,034.75x = 916,893.12
  5. Step 5: Solve for x
    x = 916,893.12/1,034.75
  6. Step 6: Final answer
    x = 886.10

Related Problems

Find fourth proportional to 517.38, 713.98 and 321.05
Half scale
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Double scale
Find fourth proportional to 1,035.75, 1,429.34 and 643.10
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.