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Finding the Fourth Proportional to 31,990.60, 47,985.90 and 20,909.80

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Solution

The fourth proportional to 31,990.60, 47,985.90 and 20,909.80 is: 31,364.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,990.60 : 47,985.90 = 20,909.80 : x
  2. Step 2: Convert to fraction form
    31,990.60/47,985.90 = 20,909.80/x
  3. Step 3: Cross multiply
    31,990.60x = 47,985.90 × 20,909.80
  4. Step 4: Simplify right side
    31,990.60x = 1,003,375,571.82
  5. Step 5: Solve for x
    x = 1,003,375,571.82/31,990.60
  6. Step 6: Final answer
    x = 31,364.70

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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.