Home / 20,781.80-31,172.70-13,783.40

Finding the Fourth Proportional to 20,781.80, 31,172.70 and 13,783.40

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Solution

The fourth proportional to 20,781.80, 31,172.70 and 13,783.40 is: 20,675.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,781.80 : 31,172.70 = 13,783.40 : x
  2. Step 2: Convert to fraction form
    20,781.80/31,172.70 = 13,783.40/x
  3. Step 3: Cross multiply
    20,781.80x = 31,172.70 × 13,783.40
  4. Step 4: Simplify right side
    20,781.80x = 429,665,793.18
  5. Step 5: Solve for x
    x = 429,665,793.18/20,781.80
  6. Step 6: Final answer
    x = 20,675.10

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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.