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Finding the Fourth Proportional to 8,939.78, 12,335.10 and 5,403.18

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Solution

The fourth proportional to 8,939.78, 12,335.10 and 5,403.18 is: 7,455.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,939.78 : 12,335.10 = 5,403.18 : x
  2. Step 2: Convert to fraction form
    8,939.78/12,335.10 = 5,403.18/x
  3. Step 3: Cross multiply
    8,939.78x = 12,335.10 × 5,403.18
  4. Step 4: Simplify right side
    8,939.78x = 66,648,765.62
  5. Step 5: Solve for x
    x = 66,648,765.62/8,939.78
  6. Step 6: Final answer
    x = 7,455.30

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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.