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Finding the Fourth Proportional to 72,908.70, 109,363.05 and 43,311.30

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Solution

The fourth proportional to 72,908.70, 109,363.05 and 43,311.30 is: 64,966.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,908.70 : 109,363.05 = 43,311.30 : x
  2. Step 2: Convert to fraction form
    72,908.70/109,363.05 = 43,311.30/x
  3. Step 3: Cross multiply
    72,908.70x = 109,363.05 × 43,311.30
  4. Step 4: Simplify right side
    72,908.70x = 4,736,655,867.47
  5. Step 5: Solve for x
    x = 4,736,655,867.47/72,908.70
  6. Step 6: Final answer
    x = 64,966.95

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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.