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Finding the Fourth Proportional to 6,291.38, 8,679.56 and 5,609.72

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Solution

The fourth proportional to 6,291.38, 8,679.56 and 5,609.72 is: 7,739.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,291.38 : 8,679.56 = 5,609.72 : x
  2. Step 2: Convert to fraction form
    6,291.38/8,679.56 = 5,609.72/x
  3. Step 3: Cross multiply
    6,291.38x = 8,679.56 × 5,609.72
  4. Step 4: Simplify right side
    6,291.38x = 48,689,901.32
  5. Step 5: Solve for x
    x = 48,689,901.32/6,291.38
  6. Step 6: Final answer
    x = 7,739.14

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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.