Home / 20,730.85-31,109.10-10,877.20

Finding the Fourth Proportional to 20,730.85, 31,109.10 and 10,877.20

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Solution

The fourth proportional to 20,730.85, 31,109.10 and 10,877.20 is: 16,322.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,730.85 : 31,109.10 = 10,877.20 : x
  2. Step 2: Convert to fraction form
    20,730.85/31,109.10 = 10,877.20/x
  3. Step 3: Cross multiply
    20,730.85x = 31,109.10 × 10,877.20
  4. Step 4: Simplify right side
    20,730.85x = 338,379,902.52
  5. Step 5: Solve for x
    x = 338,379,902.52/20,730.85
  6. Step 6: Final answer
    x = 16,322.53

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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.