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Finding the Fourth Proportional to 102.93, 154.43 and 66.39

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Solution

The fourth proportional to 102.93, 154.43 and 66.39 is: 99.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.93 : 154.43 = 66.39 : x
  2. Step 2: Convert to fraction form
    102.93/154.43 = 66.39/x
  3. Step 3: Cross multiply
    102.93x = 154.43 × 66.39
  4. Step 4: Simplify right side
    102.93x = 10,252.28
  5. Step 5: Solve for x
    x = 10,252.28/102.93
  6. Step 6: Final answer
    x = 99.60

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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.