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Finding the Fourth Proportional to 31,806.80, 47,710.20 and 20,862.80

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Solution

The fourth proportional to 31,806.80, 47,710.20 and 20,862.80 is: 31,294.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,806.80 : 47,710.20 = 20,862.80 : x
  2. Step 2: Convert to fraction form
    31,806.80/47,710.20 = 20,862.80/x
  3. Step 3: Cross multiply
    31,806.80x = 47,710.20 × 20,862.80
  4. Step 4: Simplify right side
    31,806.80x = 995,368,360.56
  5. Step 5: Solve for x
    x = 995,368,360.56/31,806.80
  6. Step 6: Final answer
    x = 31,294.20

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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.