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Finding the Fourth Proportional to 72,961.60, 109,528.80 and 72,443.20

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Solution

The fourth proportional to 72,961.60, 109,528.80 and 72,443.20 is: 108,750.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,961.60 : 109,528.80 = 72,443.20 : x
  2. Step 2: Convert to fraction form
    72,961.60/109,528.80 = 72,443.20/x
  3. Step 3: Cross multiply
    72,961.60x = 109,528.80 × 72,443.20
  4. Step 4: Simplify right side
    72,961.60x = 7,934,616,764.16
  5. Step 5: Solve for x
    x = 7,934,616,764.16/72,961.60
  6. Step 6: Final answer
    x = 108,750.59

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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.