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Finding the Fourth Proportional to 85,859.80, 128,729.70 and 50,781.40

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Solution

The fourth proportional to 85,859.80, 128,729.70 and 50,781.40 is: 76,136.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,859.80 : 128,729.70 = 50,781.40 : x
  2. Step 2: Convert to fraction form
    85,859.80/128,729.70 = 50,781.40/x
  3. Step 3: Cross multiply
    85,859.80x = 128,729.70 × 50,781.40
  4. Step 4: Simplify right side
    85,859.80x = 6,537,074,387.58
  5. Step 5: Solve for x
    x = 6,537,074,387.58/85,859.80
  6. Step 6: Final answer
    x = 76,136.61

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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.