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Finding the Fourth Proportional to 47.80, 65.95 and 29.40

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Solution

The fourth proportional to 47.80, 65.95 and 29.40 is: 40.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.80 : 65.95 = 29.40 : x
  2. Step 2: Convert to fraction form
    47.80/65.95 = 29.40/x
  3. Step 3: Cross multiply
    47.80x = 65.95 × 29.40
  4. Step 4: Simplify right side
    47.80x = 1,938.93
  5. Step 5: Solve for x
    x = 1,938.93/47.80
  6. Step 6: Final answer
    x = 40.56

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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.