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Finding the Fourth Proportional to 18,747.72, 28,123.22 and 7,655.17

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Solution

The fourth proportional to 18,747.72, 28,123.22 and 7,655.17 is: 11,483.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,747.72 : 28,123.22 = 7,655.17 : x
  2. Step 2: Convert to fraction form
    18,747.72/28,123.22 = 7,655.17/x
  3. Step 3: Cross multiply
    18,747.72x = 28,123.22 × 7,655.17
  4. Step 4: Simplify right side
    18,747.72x = 215,288,030.05
  5. Step 5: Solve for x
    x = 215,288,030.05/18,747.72
  6. Step 6: Final answer
    x = 11,483.42

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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.