Home / 10,115.15-13,958.19-5,639.15

Finding the Fourth Proportional to 10,115.15, 13,958.19 and 5,639.15

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Solution

The fourth proportional to 10,115.15, 13,958.19 and 5,639.15 is: 7,781.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,115.15 : 13,958.19 = 5,639.15 : x
  2. Step 2: Convert to fraction form
    10,115.15/13,958.19 = 5,639.15/x
  3. Step 3: Cross multiply
    10,115.15x = 13,958.19 × 5,639.15
  4. Step 4: Simplify right side
    10,115.15x = 78,712,257.35
  5. Step 5: Solve for x
    x = 78,712,257.35/10,115.15
  6. Step 6: Final answer
    x = 7,781.62

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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.