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Finding the Fourth Proportional to 18,721.74, 28,082.61 and 12,860.58

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Solution

The fourth proportional to 18,721.74, 28,082.61 and 12,860.58 is: 19,290.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,721.74 : 28,082.61 = 12,860.58 : x
  2. Step 2: Convert to fraction form
    18,721.74/28,082.61 = 12,860.58/x
  3. Step 3: Cross multiply
    18,721.74x = 28,082.61 × 12,860.58
  4. Step 4: Simplify right side
    18,721.74x = 361,158,652.51
  5. Step 5: Solve for x
    x = 361,158,652.51/18,721.74
  6. Step 6: Final answer
    x = 19,290.87

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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.