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Finding the Fourth Proportional to 83,816.70, 125,870.85 and 81,192.30

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Solution

The fourth proportional to 83,816.70, 125,870.85 and 81,192.30 is: 121,929.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,816.70 : 125,870.85 = 81,192.30 : x
  2. Step 2: Convert to fraction form
    83,816.70/125,870.85 = 81,192.30/x
  3. Step 3: Cross multiply
    83,816.70x = 125,870.85 × 81,192.30
  4. Step 4: Simplify right side
    83,816.70x = 10,219,743,814.46
  5. Step 5: Solve for x
    x = 10,219,743,814.46/83,816.70
  6. Step 6: Final answer
    x = 121,929.68

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1.5x scale

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.