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Finding the Fourth Proportional to 9,115.50, 12,580.98 and 8,699.96

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Solution

The fourth proportional to 9,115.50, 12,580.98 and 8,699.96 is: 12,007.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,115.50 : 12,580.98 = 8,699.96 : x
  2. Step 2: Convert to fraction form
    9,115.50/12,580.98 = 8,699.96/x
  3. Step 3: Cross multiply
    9,115.50x = 12,580.98 × 8,699.96
  4. Step 4: Simplify right side
    9,115.50x = 109,454,022.76
  5. Step 5: Solve for x
    x = 109,454,022.76/9,115.50
  6. Step 6: Final answer
    x = 12,007.46

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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.