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Finding the Fourth Proportional to 81,411.70, 122,117.55 and 65,859.70

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Solution

The fourth proportional to 81,411.70, 122,117.55 and 65,859.70 is: 98,789.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,411.70 : 122,117.55 = 65,859.70 : x
  2. Step 2: Convert to fraction form
    81,411.70/122,117.55 = 65,859.70/x
  3. Step 3: Cross multiply
    81,411.70x = 122,117.55 × 65,859.70
  4. Step 4: Simplify right side
    81,411.70x = 8,042,625,207.74
  5. Step 5: Solve for x
    x = 8,042,625,207.74/81,411.70
  6. Step 6: Final answer
    x = 98,789.55

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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.