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Finding the Fourth Proportional to 9,363.31, 12,921.36 and 5,385.20

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Solution

The fourth proportional to 9,363.31, 12,921.36 and 5,385.20 is: 7,431.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,363.31 : 12,921.36 = 5,385.20 : x
  2. Step 2: Convert to fraction form
    9,363.31/12,921.36 = 5,385.20/x
  3. Step 3: Cross multiply
    9,363.31x = 12,921.36 × 5,385.20
  4. Step 4: Simplify right side
    9,363.31x = 69,584,107.87
  5. Step 5: Solve for x
    x = 69,584,107.87/9,363.31
  6. Step 6: Final answer
    x = 7,431.57

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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.