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Finding the Fourth Proportional to 47.42, 65.39 and 31.04

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Solution

The fourth proportional to 47.42, 65.39 and 31.04 is: 42.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.42 : 65.39 = 31.04 : x
  2. Step 2: Convert to fraction form
    47.42/65.39 = 31.04/x
  3. Step 3: Cross multiply
    47.42x = 65.39 × 31.04
  4. Step 4: Simplify right side
    47.42x = 2,029.71
  5. Step 5: Solve for x
    x = 2,029.71/47.42
  6. Step 6: Final answer
    x = 42.80

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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.