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Finding the Fourth Proportional to 77,909.75, 107,491.49 and 47,663.54

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Solution

The fourth proportional to 77,909.75, 107,491.49 and 47,663.54 is: 65,761.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,909.75 : 107,491.49 = 47,663.54 : x
  2. Step 2: Convert to fraction form
    77,909.75/107,491.49 = 47,663.54/x
  3. Step 3: Cross multiply
    77,909.75x = 107,491.49 × 47,663.54
  4. Step 4: Simplify right side
    77,909.75x = 5,123,424,739.33
  5. Step 5: Solve for x
    x = 5,123,424,739.33/77,909.75
  6. Step 6: Final answer
    x = 65,761.02

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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.