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Finding the Fourth Proportional to 18,878.31, 28,321.11 and 10,123.02

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Solution

The fourth proportional to 18,878.31, 28,321.11 and 10,123.02 is: 15,186.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,878.31 : 28,321.11 = 10,123.02 : x
  2. Step 2: Convert to fraction form
    18,878.31/28,321.11 = 10,123.02/x
  3. Step 3: Cross multiply
    18,878.31x = 28,321.11 × 10,123.02
  4. Step 4: Simplify right side
    18,878.31x = 286,695,162.95
  5. Step 5: Solve for x
    x = 286,695,162.95/18,878.31
  6. Step 6: Final answer
    x = 15,186.48

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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.