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Finding the Fourth Proportional to 78.62, 117.64 and 67.24

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Solution

The fourth proportional to 78.62, 117.64 and 67.24 is: 100.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.62 : 117.64 = 67.24 : x
  2. Step 2: Convert to fraction form
    78.62/117.64 = 67.24/x
  3. Step 3: Cross multiply
    78.62x = 117.64 × 67.24
  4. Step 4: Simplify right side
    78.62x = 7,909.19
  5. Step 5: Solve for x
    x = 7,909.19/78.62
  6. Step 6: Final answer
    x = 100.60

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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.