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Finding the Fourth Proportional to 78.71, 117.36 and 73.58

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Solution

The fourth proportional to 78.71, 117.36 and 73.58 is: 109.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.71 : 117.36 = 73.58 : x
  2. Step 2: Convert to fraction form
    78.71/117.36 = 73.58/x
  3. Step 3: Cross multiply
    78.71x = 117.36 × 73.58
  4. Step 4: Simplify right side
    78.71x = 8,634.76
  5. Step 5: Solve for x
    x = 8,634.76/78.71
  6. Step 6: Final answer
    x = 109.71

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.