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Finding the Fourth Proportional to 742.70, 1,025.25 and 565.69

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Solution

The fourth proportional to 742.70, 1,025.25 and 565.69 is: 780.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.70 : 1,025.25 = 565.69 : x
  2. Step 2: Convert to fraction form
    742.70/1,025.25 = 565.69/x
  3. Step 3: Cross multiply
    742.70x = 1,025.25 × 565.69
  4. Step 4: Simplify right side
    742.70x = 579,973.67
  5. Step 5: Solve for x
    x = 579,973.67/742.70
  6. Step 6: Final answer
    x = 780.90

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Double scale
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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.