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Finding the Fourth Proportional to 78,722.87, 108,637.61 and 44,731.40

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Solution

The fourth proportional to 78,722.87, 108,637.61 and 44,731.40 is: 61,729.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,722.87 : 108,637.61 = 44,731.40 : x
  2. Step 2: Convert to fraction form
    78,722.87/108,637.61 = 44,731.40/x
  3. Step 3: Cross multiply
    78,722.87x = 108,637.61 × 44,731.40
  4. Step 4: Simplify right side
    78,722.87x = 4,859,511,621.11
  5. Step 5: Solve for x
    x = 4,859,511,621.11/78,722.87
  6. Step 6: Final answer
    x = 61,729.35

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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.