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Finding the Fourth Proportional to 73.68, 101.42 and 66.40

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Solution

The fourth proportional to 73.68, 101.42 and 66.40 is: 91.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    73.68 : 101.42 = 66.40 : x
  2. Step 2: Convert to fraction form
    73.68/101.42 = 66.40/x
  3. Step 3: Cross multiply
    73.68x = 101.42 × 66.40
  4. Step 4: Simplify right side
    73.68x = 6,734.29
  5. Step 5: Solve for x
    x = 6,734.29/73.68
  6. Step 6: Final answer
    x = 91.40

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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.