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Finding the Fourth Proportional to 8,918.60, 12,305.91 and 5,381.74

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Solution

The fourth proportional to 8,918.60, 12,305.91 and 5,381.74 is: 7,425.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,918.60 : 12,305.91 = 5,381.74 : x
  2. Step 2: Convert to fraction form
    8,918.60/12,305.91 = 5,381.74/x
  3. Step 3: Cross multiply
    8,918.60x = 12,305.91 × 5,381.74
  4. Step 4: Simplify right side
    8,918.60x = 66,227,119.65
  5. Step 5: Solve for x
    x = 66,227,119.65/8,918.60
  6. Step 6: Final answer
    x = 7,425.73

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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.