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Finding the Fourth Proportional to 31,781.60, 47,672.40 and 20,146.40

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Solution

The fourth proportional to 31,781.60, 47,672.40 and 20,146.40 is: 30,219.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,781.60 : 47,672.40 = 20,146.40 : x
  2. Step 2: Convert to fraction form
    31,781.60/47,672.40 = 20,146.40/x
  3. Step 3: Cross multiply
    31,781.60x = 47,672.40 × 20,146.40
  4. Step 4: Simplify right side
    31,781.60x = 960,427,239.36
  5. Step 5: Solve for x
    x = 960,427,239.36/31,781.60
  6. Step 6: Final answer
    x = 30,219.60

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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.