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Finding the Fourth Proportional to 561.43, 842.43 and 425.31

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Solution

The fourth proportional to 561.43, 842.43 and 425.31 is: 638.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.43 : 842.43 = 425.31 : x
  2. Step 2: Convert to fraction form
    561.43/842.43 = 425.31/x
  3. Step 3: Cross multiply
    561.43x = 842.43 × 425.31
  4. Step 4: Simplify right side
    561.43x = 358,293.90
  5. Step 5: Solve for x
    x = 358,293.90/561.43
  6. Step 6: Final answer
    x = 638.18

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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.