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Finding the Fourth Proportional to 72.60, 99.60 and 67.20

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Solution

The fourth proportional to 72.60, 99.60 and 67.20 is: 92.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.60 : 99.60 = 67.20 : x
  2. Step 2: Convert to fraction form
    72.60/99.60 = 67.20/x
  3. Step 3: Cross multiply
    72.60x = 99.60 × 67.20
  4. Step 4: Simplify right side
    72.60x = 6,693.12
  5. Step 5: Solve for x
    x = 6,693.12/72.60
  6. Step 6: Final answer
    x = 92.19

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.