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Finding the Fourth Proportional to 61.31, 91.80 and 32.31

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Solution

The fourth proportional to 61.31, 91.80 and 32.31 is: 48.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.31 : 91.80 = 32.31 : x
  2. Step 2: Convert to fraction form
    61.31/91.80 = 32.31/x
  3. Step 3: Cross multiply
    61.31x = 91.80 × 32.31
  4. Step 4: Simplify right side
    61.31x = 2,966.06
  5. Step 5: Solve for x
    x = 2,966.06/61.31
  6. Step 6: Final answer
    x = 48.38

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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.