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Finding the Fourth Proportional to 78.47, 108.31 and 52.29

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Solution

The fourth proportional to 78.47, 108.31 and 52.29 is: 72.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.47 : 108.31 = 52.29 : x
  2. Step 2: Convert to fraction form
    78.47/108.31 = 52.29/x
  3. Step 3: Cross multiply
    78.47x = 108.31 × 52.29
  4. Step 4: Simplify right side
    78.47x = 5,663.09
  5. Step 5: Solve for x
    x = 5,663.09/78.47
  6. Step 6: Final answer
    x = 72.17

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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.