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Finding the Fourth Proportional to 557.32, 831.20 and 528.16

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Solution

The fourth proportional to 557.32, 831.20 and 528.16 is: 787.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    557.32 : 831.20 = 528.16 : x
  2. Step 2: Convert to fraction form
    557.32/831.20 = 528.16/x
  3. Step 3: Cross multiply
    557.32x = 831.20 × 528.16
  4. Step 4: Simplify right side
    557.32x = 439,006.59
  5. Step 5: Solve for x
    x = 439,006.59/557.32
  6. Step 6: Final answer
    x = 787.71

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.