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Finding the Fourth Proportional to 38,781.65, 58,158.11 and 13,815.07

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Solution

The fourth proportional to 38,781.65, 58,158.11 and 13,815.07 is: 20,717.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,781.65 : 58,158.11 = 13,815.07 : x
  2. Step 2: Convert to fraction form
    38,781.65/58,158.11 = 13,815.07/x
  3. Step 3: Cross multiply
    38,781.65x = 58,158.11 × 13,815.07
  4. Step 4: Simplify right side
    38,781.65x = 803,458,180.78
  5. Step 5: Solve for x
    x = 803,458,180.78/38,781.65
  6. Step 6: Final answer
    x = 20,717.48

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.