Home / 20,781.40-31,172.10-12,011.80

Finding the Fourth Proportional to 20,781.40, 31,172.10 and 12,011.80

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Solution

The fourth proportional to 20,781.40, 31,172.10 and 12,011.80 is: 18,017.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,781.40 : 31,172.10 = 12,011.80 : x
  2. Step 2: Convert to fraction form
    20,781.40/31,172.10 = 12,011.80/x
  3. Step 3: Cross multiply
    20,781.40x = 31,172.10 × 12,011.80
  4. Step 4: Simplify right side
    20,781.40x = 374,433,030.78
  5. Step 5: Solve for x
    x = 374,433,030.78/20,781.40
  6. Step 6: Final answer
    x = 18,017.70

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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.