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Finding the Fourth Proportional to 9,363.87, 12,921.88 and 5,115.05

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Solution

The fourth proportional to 9,363.87, 12,921.88 and 5,115.05 is: 7,058.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,363.87 : 12,921.88 = 5,115.05 : x
  2. Step 2: Convert to fraction form
    9,363.87/12,921.88 = 5,115.05/x
  3. Step 3: Cross multiply
    9,363.87x = 12,921.88 × 5,115.05
  4. Step 4: Simplify right side
    9,363.87x = 66,096,062.29
  5. Step 5: Solve for x
    x = 66,096,062.29/9,363.87
  6. Step 6: Final answer
    x = 7,058.63

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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.