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Finding the Fourth Proportional to 90,985.70, 136,502.85 and 81,192.80

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Solution

The fourth proportional to 90,985.70, 136,502.85 and 81,192.80 is: 121,810.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,985.70 : 136,502.85 = 81,192.80 : x
  2. Step 2: Convert to fraction form
    90,985.70/136,502.85 = 81,192.80/x
  3. Step 3: Cross multiply
    90,985.70x = 136,502.85 × 81,192.80
  4. Step 4: Simplify right side
    90,985.70x = 11,083,048,599.48
  5. Step 5: Solve for x
    x = 11,083,048,599.48/90,985.70
  6. Step 6: Final answer
    x = 121,810.88

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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.