Home / 20,385.97-28,132.65-11,888.47

Finding the Fourth Proportional to 20,385.97, 28,132.65 and 11,888.47

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Solution

The fourth proportional to 20,385.97, 28,132.65 and 11,888.47 is: 16,406.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,385.97 : 28,132.65 = 11,888.47 : x
  2. Step 2: Convert to fraction form
    20,385.97/28,132.65 = 11,888.47/x
  3. Step 3: Cross multiply
    20,385.97x = 28,132.65 × 11,888.47
  4. Step 4: Simplify right side
    20,385.97x = 334,454,165.55
  5. Step 5: Solve for x
    x = 334,454,165.55/20,385.97
  6. Step 6: Final answer
    x = 16,406.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.