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Finding the Fourth Proportional to 90,889.20, 136,200.15 and 65,981.70

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Solution

The fourth proportional to 90,889.20, 136,200.15 and 65,981.70 is: 98,875.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,889.20 : 136,200.15 = 65,981.70 : x
  2. Step 2: Convert to fraction form
    90,889.20/136,200.15 = 65,981.70/x
  3. Step 3: Cross multiply
    90,889.20x = 136,200.15 × 65,981.70
  4. Step 4: Simplify right side
    90,889.20x = 8,986,717,437.26
  5. Step 5: Solve for x
    x = 8,986,717,437.26/90,889.20
  6. Step 6: Final answer
    x = 98,875.53

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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.