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Finding the Fourth Proportional to 100,857.20, 151,285.80 and 89,970.80

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Solution

The fourth proportional to 100,857.20, 151,285.80 and 89,970.80 is: 134,956.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,857.20 : 151,285.80 = 89,970.80 : x
  2. Step 2: Convert to fraction form
    100,857.20/151,285.80 = 89,970.80/x
  3. Step 3: Cross multiply
    100,857.20x = 151,285.80 × 89,970.80
  4. Step 4: Simplify right side
    100,857.20x = 13,611,304,454.64
  5. Step 5: Solve for x
    x = 13,611,304,454.64/100,857.20
  6. Step 6: Final answer
    x = 134,956.20

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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.