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Finding the Fourth Proportional to 18,862.80, 28,275.66 and 8,338.56

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Solution

The fourth proportional to 18,862.80, 28,275.66 and 8,338.56 is: 12,499.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,862.80 : 28,275.66 = 8,338.56 : x
  2. Step 2: Convert to fraction form
    18,862.80/28,275.66 = 8,338.56/x
  3. Step 3: Cross multiply
    18,862.80x = 28,275.66 × 8,338.56
  4. Step 4: Simplify right side
    18,862.80x = 235,778,287.45
  5. Step 5: Solve for x
    x = 235,778,287.45/18,862.80
  6. Step 6: Final answer
    x = 12,499.64

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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.