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Finding the Fourth Proportional to 602.72, 831.48 and 428.24

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Solution

The fourth proportional to 602.72, 831.48 and 428.24 is: 590.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    602.72 : 831.48 = 428.24 : x
  2. Step 2: Convert to fraction form
    602.72/831.48 = 428.24/x
  3. Step 3: Cross multiply
    602.72x = 831.48 × 428.24
  4. Step 4: Simplify right side
    602.72x = 356,073.00
  5. Step 5: Solve for x
    x = 356,073.00/602.72
  6. Step 6: Final answer
    x = 590.78

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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.