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Finding the Fourth Proportional to 98,949.20, 148,423.80 and 72,705.20

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Solution

The fourth proportional to 98,949.20, 148,423.80 and 72,705.20 is: 109,057.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,949.20 : 148,423.80 = 72,705.20 : x
  2. Step 2: Convert to fraction form
    98,949.20/148,423.80 = 72,705.20/x
  3. Step 3: Cross multiply
    98,949.20x = 148,423.80 × 72,705.20
  4. Step 4: Simplify right side
    98,949.20x = 10,791,182,063.76
  5. Step 5: Solve for x
    x = 10,791,182,063.76/98,949.20
  6. Step 6: Final answer
    x = 109,057.80

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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.