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Finding the Fourth Proportional to 78,709.28, 108,621.18 and 42,901.61

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Solution

The fourth proportional to 78,709.28, 108,621.18 and 42,901.61 is: 59,205.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,709.28 : 108,621.18 = 42,901.61 : x
  2. Step 2: Convert to fraction form
    78,709.28/108,621.18 = 42,901.61/x
  3. Step 3: Cross multiply
    78,709.28x = 108,621.18 × 42,901.61
  4. Step 4: Simplify right side
    78,709.28x = 4,660,022,958.99
  5. Step 5: Solve for x
    x = 4,660,022,958.99/78,709.28
  6. Step 6: Final answer
    x = 59,205.51

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.