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Finding the Fourth Proportional to 18,734.72, 28,103.69 and 7,642.17

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Solution

The fourth proportional to 18,734.72, 28,103.69 and 7,642.17 is: 11,463.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,734.72 : 28,103.69 = 7,642.17 : x
  2. Step 2: Convert to fraction form
    18,734.72/28,103.69 = 7,642.17/x
  3. Step 3: Cross multiply
    18,734.72x = 28,103.69 × 7,642.17
  4. Step 4: Simplify right side
    18,734.72x = 214,773,195.71
  5. Step 5: Solve for x
    x = 214,773,195.71/18,734.72
  6. Step 6: Final answer
    x = 11,463.92

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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.