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Finding the Fourth Proportional to 8,917.20, 13,436.10 and 7,391.16

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Solution

The fourth proportional to 8,917.20, 13,436.10 and 7,391.16 is: 11,136.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,917.20 : 13,436.10 = 7,391.16 : x
  2. Step 2: Convert to fraction form
    8,917.20/13,436.10 = 7,391.16/x
  3. Step 3: Cross multiply
    8,917.20x = 13,436.10 × 7,391.16
  4. Step 4: Simplify right side
    8,917.20x = 99,308,364.88
  5. Step 5: Solve for x
    x = 99,308,364.88/8,917.20
  6. Step 6: Final answer
    x = 11,136.72

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.