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Finding the Fourth Proportional to 77,912.91, 107,519.85 and 42,102.92

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Solution

The fourth proportional to 77,912.91, 107,519.85 and 42,102.92 is: 58,102.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,912.91 : 107,519.85 = 42,102.92 : x
  2. Step 2: Convert to fraction form
    77,912.91/107,519.85 = 42,102.92/x
  3. Step 3: Cross multiply
    77,912.91x = 107,519.85 × 42,102.92
  4. Step 4: Simplify right side
    77,912.91x = 4,526,899,911.76
  5. Step 5: Solve for x
    x = 4,526,899,911.76/77,912.91
  6. Step 6: Final answer
    x = 58,102.05

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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.