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Finding the Fourth Proportional to 47.76, 65.85 and 31.35

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Solution

The fourth proportional to 47.76, 65.85 and 31.35 is: 43.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.76 : 65.85 = 31.35 : x
  2. Step 2: Convert to fraction form
    47.76/65.85 = 31.35/x
  3. Step 3: Cross multiply
    47.76x = 65.85 × 31.35
  4. Step 4: Simplify right side
    47.76x = 2,064.40
  5. Step 5: Solve for x
    x = 2,064.40/47.76
  6. Step 6: Final answer
    x = 43.22

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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.