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Finding the Fourth Proportional to 31.57, 47.63 and 29.91

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Solution

The fourth proportional to 31.57, 47.63 and 29.91 is: 45.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.57 : 47.63 = 29.91 : x
  2. Step 2: Convert to fraction form
    31.57/47.63 = 29.91/x
  3. Step 3: Cross multiply
    31.57x = 47.63 × 29.91
  4. Step 4: Simplify right side
    31.57x = 1,424.61
  5. Step 5: Solve for x
    x = 1,424.61/31.57
  6. Step 6: Final answer
    x = 45.13

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.