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Finding the Fourth Proportional to 73.20, 109.72 and 56.15

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Solution

The fourth proportional to 73.20, 109.72 and 56.15 is: 84.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    73.20 : 109.72 = 56.15 : x
  2. Step 2: Convert to fraction form
    73.20/109.72 = 56.15/x
  3. Step 3: Cross multiply
    73.20x = 109.72 × 56.15
  4. Step 4: Simplify right side
    73.20x = 6,160.50
  5. Step 5: Solve for x
    x = 6,160.50/73.20
  6. Step 6: Final answer
    x = 84.17

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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.