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Finding the Fourth Proportional to 972.08, 1,341.32 and 558

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Solution

The fourth proportional to 972.08, 1,341.32 and 558 is: 769.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    972.08 : 1,341.32 = 558 : x
  2. Step 2: Convert to fraction form
    972.08/1,341.32 = 558/x
  3. Step 3: Cross multiply
    972.08x = 1,341.32 × 558
  4. Step 4: Simplify right side
    972.08x = 748,456.56
  5. Step 5: Solve for x
    x = 748,456.56/972.08
  6. Step 6: Final answer
    x = 769.95

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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.