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Finding the Fourth Proportional to 15,397.92, 21,251.16 and 8,685

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Solution

The fourth proportional to 15,397.92, 21,251.16 and 8,685 is: 11,986.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,397.92 : 21,251.16 = 8,685 : x
  2. Step 2: Convert to fraction form
    15,397.92/21,251.16 = 8,685/x
  3. Step 3: Cross multiply
    15,397.92x = 21,251.16 × 8,685
  4. Step 4: Simplify right side
    15,397.92x = 184,566,324.60
  5. Step 5: Solve for x
    x = 184,566,324.60/15,397.92
  6. Step 6: Final answer
    x = 11,986.45

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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.