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Finding the Fourth Proportional to 67.65, 101.52 and 47.40

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Solution

The fourth proportional to 67.65, 101.52 and 47.40 is: 71.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.65 : 101.52 = 47.40 : x
  2. Step 2: Convert to fraction form
    67.65/101.52 = 47.40/x
  3. Step 3: Cross multiply
    67.65x = 101.52 × 47.40
  4. Step 4: Simplify right side
    67.65x = 4,812.05
  5. Step 5: Solve for x
    x = 4,812.05/67.65
  6. Step 6: Final answer
    x = 71.13

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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.