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Finding the Fourth Proportional to 710.47, 1,065.85 and 402.47

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Solution

The fourth proportional to 710.47, 1,065.85 and 402.47 is: 603.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    710.47 : 1,065.85 = 402.47 : x
  2. Step 2: Convert to fraction form
    710.47/1,065.85 = 402.47/x
  3. Step 3: Cross multiply
    710.47x = 1,065.85 × 402.47
  4. Step 4: Simplify right side
    710.47x = 428,967.32
  5. Step 5: Solve for x
    x = 428,967.32/710.47
  6. Step 6: Final answer
    x = 603.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.