Home / 15,398.50-21,251.22-8,683.78

Finding the Fourth Proportional to 15,398.50, 21,251.22 and 8,683.78

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Solution

The fourth proportional to 15,398.50, 21,251.22 and 8,683.78 is: 11,984.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,398.50 : 21,251.22 = 8,683.78 : x
  2. Step 2: Convert to fraction form
    15,398.50/21,251.22 = 8,683.78/x
  3. Step 3: Cross multiply
    15,398.50x = 21,251.22 × 8,683.78
  4. Step 4: Simplify right side
    15,398.50x = 184,540,919.21
  5. Step 5: Solve for x
    x = 184,540,919.21/15,398.50
  6. Step 6: Final answer
    x = 11,984.34

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Half scale
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Double scale
Find fourth proportional to 15,399.50, 21,252.60 and 8,684.78
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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.