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Finding the Fourth Proportional to 39,761.60, 59,649.60 and 19,990.40

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Solution

The fourth proportional to 39,761.60, 59,649.60 and 19,990.40 is: 29,989.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,761.60 : 59,649.60 = 19,990.40 : x
  2. Step 2: Convert to fraction form
    39,761.60/59,649.60 = 19,990.40/x
  3. Step 3: Cross multiply
    39,761.60x = 59,649.60 × 19,990.40
  4. Step 4: Simplify right side
    39,761.60x = 1,192,419,363.84
  5. Step 5: Solve for x
    x = 1,192,419,363.84/39,761.60
  6. Step 6: Final answer
    x = 29,989.22

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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.