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Finding the Fourth Proportional to 572.32, 861.59 and 390.86

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Solution

The fourth proportional to 572.32, 861.59 and 390.86 is: 588.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    572.32 : 861.59 = 390.86 : x
  2. Step 2: Convert to fraction form
    572.32/861.59 = 390.86/x
  3. Step 3: Cross multiply
    572.32x = 861.59 × 390.86
  4. Step 4: Simplify right side
    572.32x = 336,757.74
  5. Step 5: Solve for x
    x = 336,757.74/572.32
  6. Step 6: Final answer
    x = 588.41

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.