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Finding the Fourth Proportional to 18,117.91, 24,994.20 and 12,815.65

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Solution

The fourth proportional to 18,117.91, 24,994.20 and 12,815.65 is: 17,679.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,117.91 : 24,994.20 = 12,815.65 : x
  2. Step 2: Convert to fraction form
    18,117.91/24,994.20 = 12,815.65/x
  3. Step 3: Cross multiply
    18,117.91x = 24,994.20 × 12,815.65
  4. Step 4: Simplify right side
    18,117.91x = 320,316,856.74
  5. Step 5: Solve for x
    x = 320,316,856.74/18,117.91
  6. Step 6: Final answer
    x = 17,679.57

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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.