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Finding the Fourth Proportional to 972.34, 1,342.37 and 641.55

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Solution

The fourth proportional to 972.34, 1,342.37 and 641.55 is: 885.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    972.34 : 1,342.37 = 641.55 : x
  2. Step 2: Convert to fraction form
    972.34/1,342.37 = 641.55/x
  3. Step 3: Cross multiply
    972.34x = 1,342.37 × 641.55
  4. Step 4: Simplify right side
    972.34x = 861,204.11
  5. Step 5: Solve for x
    x = 861,204.11/972.34
  6. Step 6: Final answer
    x = 885.70

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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.