Home / 15,405.96-21,255.30-9,117.12

Finding the Fourth Proportional to 15,405.96, 21,255.30 and 9,117.12

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Solution

The fourth proportional to 15,405.96, 21,255.30 and 9,117.12 is: 12,578.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,405.96 : 21,255.30 = 9,117.12 : x
  2. Step 2: Convert to fraction form
    15,405.96/21,255.30 = 9,117.12/x
  3. Step 3: Cross multiply
    15,405.96x = 21,255.30 × 9,117.12
  4. Step 4: Simplify right side
    15,405.96x = 193,787,120.74
  5. Step 5: Solve for x
    x = 193,787,120.74/15,405.96
  6. Step 6: Final answer
    x = 12,578.71

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Double scale
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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.