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Finding the Fourth Proportional to 78.06, 116.98 and 72.92

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Solution

The fourth proportional to 78.06, 116.98 and 72.92 is: 109.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.06 : 116.98 = 72.92 : x
  2. Step 2: Convert to fraction form
    78.06/116.98 = 72.92/x
  3. Step 3: Cross multiply
    78.06x = 116.98 × 72.92
  4. Step 4: Simplify right side
    78.06x = 8,530.18
  5. Step 5: Solve for x
    x = 8,530.18/78.06
  6. Step 6: Final answer
    x = 109.28

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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.