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Finding the Fourth Proportional to 71.52, 107.28 and 30.93

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Solution

The fourth proportional to 71.52, 107.28 and 30.93 is: 46.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.52 : 107.28 = 30.93 : x
  2. Step 2: Convert to fraction form
    71.52/107.28 = 30.93/x
  3. Step 3: Cross multiply
    71.52x = 107.28 × 30.93
  4. Step 4: Simplify right side
    71.52x = 3,318.17
  5. Step 5: Solve for x
    x = 3,318.17/71.52
  6. Step 6: Final answer
    x = 46.40

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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.