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Finding the Fourth Proportional to 15,112.65, 20,854.50 and 8,397.87

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Solution

The fourth proportional to 15,112.65, 20,854.50 and 8,397.87 is: 11,588.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,112.65 : 20,854.50 = 8,397.87 : x
  2. Step 2: Convert to fraction form
    15,112.65/20,854.50 = 8,397.87/x
  3. Step 3: Cross multiply
    15,112.65x = 20,854.50 × 8,397.87
  4. Step 4: Simplify right side
    15,112.65x = 175,133,379.92
  5. Step 5: Solve for x
    x = 175,133,379.92/15,112.65
  6. Step 6: Final answer
    x = 11,588.53

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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.