Home / 20,943.12-28,891.80-13,385.76

Finding the Fourth Proportional to 20,943.12, 28,891.80 and 13,385.76

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Solution

The fourth proportional to 20,943.12, 28,891.80 and 13,385.76 is: 18,466.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,943.12 : 28,891.80 = 13,385.76 : x
  2. Step 2: Convert to fraction form
    20,943.12/28,891.80 = 13,385.76/x
  3. Step 3: Cross multiply
    20,943.12x = 28,891.80 × 13,385.76
  4. Step 4: Simplify right side
    20,943.12x = 386,738,700.77
  5. Step 5: Solve for x
    x = 386,738,700.77/20,943.12
  6. Step 6: Final answer
    x = 18,466.15

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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.