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Finding the Fourth Proportional to 8,861.15, 13,291.75 and 8,319.87

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Solution

The fourth proportional to 8,861.15, 13,291.75 and 8,319.87 is: 12,479.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,861.15 : 13,291.75 = 8,319.87 : x
  2. Step 2: Convert to fraction form
    8,861.15/13,291.75 = 8,319.87/x
  3. Step 3: Cross multiply
    8,861.15x = 13,291.75 × 8,319.87
  4. Step 4: Simplify right side
    8,861.15x = 110,585,590.47
  5. Step 5: Solve for x
    x = 110,585,590.47/8,861.15
  6. Step 6: Final answer
    x = 12,479.82

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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.