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Finding the Fourth Proportional to 13,398.08, 18,490.08 and 8,686.40

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Solution

The fourth proportional to 13,398.08, 18,490.08 and 8,686.40 is: 11,987.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,398.08 : 18,490.08 = 8,686.40 : x
  2. Step 2: Convert to fraction form
    13,398.08/18,490.08 = 8,686.40/x
  3. Step 3: Cross multiply
    13,398.08x = 18,490.08 × 8,686.40
  4. Step 4: Simplify right side
    13,398.08x = 160,612,230.91
  5. Step 5: Solve for x
    x = 160,612,230.91/13,398.08
  6. Step 6: Final answer
    x = 11,987.71

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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.