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Finding the Fourth Proportional to 61.63, 92.40 and 31.17

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Solution

The fourth proportional to 61.63, 92.40 and 31.17 is: 46.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.63 : 92.40 = 31.17 : x
  2. Step 2: Convert to fraction form
    61.63/92.40 = 31.17/x
  3. Step 3: Cross multiply
    61.63x = 92.40 × 31.17
  4. Step 4: Simplify right side
    61.63x = 2,880.11
  5. Step 5: Solve for x
    x = 2,880.11/61.63
  6. Step 6: Final answer
    x = 46.73

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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.