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Finding the Fourth Proportional to 9,139, 12,608.22 and 5,780.56

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Solution

The fourth proportional to 9,139, 12,608.22 and 5,780.56 is: 7,974.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,139 : 12,608.22 = 5,780.56 : x
  2. Step 2: Convert to fraction form
    9,139/12,608.22 = 5,780.56/x
  3. Step 3: Cross multiply
    9,139x = 12,608.22 × 5,780.56
  4. Step 4: Simplify right side
    9,139x = 72,882,572.20
  5. Step 5: Solve for x
    x = 72,882,572.20/9,139
  6. Step 6: Final answer
    x = 7,974.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.