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Finding the Fourth Proportional to 558.14, 831.31 and 528.86

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Solution

The fourth proportional to 558.14, 831.31 and 528.86 is: 787.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    558.14 : 831.31 = 528.86 : x
  2. Step 2: Convert to fraction form
    558.14/831.31 = 528.86/x
  3. Step 3: Cross multiply
    558.14x = 831.31 × 528.86
  4. Step 4: Simplify right side
    558.14x = 439,646.61
  5. Step 5: Solve for x
    x = 439,646.61/558.14
  6. Step 6: Final answer
    x = 787.70

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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.