Home / 20,770.28-31,159.06-8,931.32

Finding the Fourth Proportional to 20,770.28, 31,159.06 and 8,931.32

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Solution

The fourth proportional to 20,770.28, 31,159.06 and 8,931.32 is: 13,398.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,770.28 : 31,159.06 = 8,931.32 : x
  2. Step 2: Convert to fraction form
    20,770.28/31,159.06 = 8,931.32/x
  3. Step 3: Cross multiply
    20,770.28x = 31,159.06 × 8,931.32
  4. Step 4: Simplify right side
    20,770.28x = 278,291,535.76
  5. Step 5: Solve for x
    x = 278,291,535.76/20,770.28
  6. Step 6: Final answer
    x = 13,398.55

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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.