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Finding the Fourth Proportional to 71,959.94, 99,305.15 and 40,130.85

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Solution

The fourth proportional to 71,959.94, 99,305.15 and 40,130.85 is: 55,380.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,959.94 : 99,305.15 = 40,130.85 : x
  2. Step 2: Convert to fraction form
    71,959.94/99,305.15 = 40,130.85/x
  3. Step 3: Cross multiply
    71,959.94x = 99,305.15 × 40,130.85
  4. Step 4: Simplify right side
    71,959.94x = 3,985,199,878.22
  5. Step 5: Solve for x
    x = 3,985,199,878.22/71,959.94
  6. Step 6: Final answer
    x = 55,380.82

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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.