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Finding the Fourth Proportional to 71,539.80, 107,309.70 and 42,015.30

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Solution

The fourth proportional to 71,539.80, 107,309.70 and 42,015.30 is: 63,022.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,539.80 : 107,309.70 = 42,015.30 : x
  2. Step 2: Convert to fraction form
    71,539.80/107,309.70 = 42,015.30/x
  3. Step 3: Cross multiply
    71,539.80x = 107,309.70 × 42,015.30
  4. Step 4: Simplify right side
    71,539.80x = 4,508,649,238.41
  5. Step 5: Solve for x
    x = 4,508,649,238.41/71,539.80
  6. Step 6: Final answer
    x = 63,022.95

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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.