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Finding the Fourth Proportional to 8,921.73, 12,318.98 and 7,161.20

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Solution

The fourth proportional to 8,921.73, 12,318.98 and 7,161.20 is: 9,888.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,921.73 : 12,318.98 = 7,161.20 : x
  2. Step 2: Convert to fraction form
    8,921.73/12,318.98 = 7,161.20/x
  3. Step 3: Cross multiply
    8,921.73x = 12,318.98 × 7,161.20
  4. Step 4: Simplify right side
    8,921.73x = 88,218,582.18
  5. Step 5: Solve for x
    x = 88,218,582.18/8,921.73
  6. Step 6: Final answer
    x = 9,888.06

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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.