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Finding the Fourth Proportional to 72.59, 109.04 and 61.20

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Solution

The fourth proportional to 72.59, 109.04 and 61.20 is: 91.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.59 : 109.04 = 61.20 : x
  2. Step 2: Convert to fraction form
    72.59/109.04 = 61.20/x
  3. Step 3: Cross multiply
    72.59x = 109.04 × 61.20
  4. Step 4: Simplify right side
    72.59x = 6,673.11
  5. Step 5: Solve for x
    x = 6,673.11/72.59
  6. Step 6: Final answer
    x = 91.93

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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.