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Finding the Fourth Proportional to 615.43, 921.37 and 572.18

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Solution

The fourth proportional to 615.43, 921.37 and 572.18 is: 856.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.43 : 921.37 = 572.18 : x
  2. Step 2: Convert to fraction form
    615.43/921.37 = 572.18/x
  3. Step 3: Cross multiply
    615.43x = 921.37 × 572.18
  4. Step 4: Simplify right side
    615.43x = 527,182.02
  5. Step 5: Solve for x
    x = 527,182.02/615.43
  6. Step 6: Final answer
    x = 856.61

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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.