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Finding the Fourth Proportional to 112,997.85, 155,965.22 and 65,278.87

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Solution

The fourth proportional to 112,997.85, 155,965.22 and 65,278.87 is: 90,101.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,997.85 : 155,965.22 = 65,278.87 : x
  2. Step 2: Convert to fraction form
    112,997.85/155,965.22 = 65,278.87/x
  3. Step 3: Cross multiply
    112,997.85x = 155,965.22 × 65,278.87
  4. Step 4: Simplify right side
    112,997.85x = 10,181,234,129.62
  5. Step 5: Solve for x
    x = 10,181,234,129.62/112,997.85
  6. Step 6: Final answer
    x = 90,101.13

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.