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Finding the Fourth Proportional to 103,805.80, 155,708.70 and 85,106.95

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Solution

The fourth proportional to 103,805.80, 155,708.70 and 85,106.95 is: 127,660.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,805.80 : 155,708.70 = 85,106.95 : x
  2. Step 2: Convert to fraction form
    103,805.80/155,708.70 = 85,106.95/x
  3. Step 3: Cross multiply
    103,805.80x = 155,708.70 × 85,106.95
  4. Step 4: Simplify right side
    103,805.80x = 13,251,892,545.47
  5. Step 5: Solve for x
    x = 13,251,892,545.47/103,805.80
  6. Step 6: Final answer
    x = 127,660.43

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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.