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Finding the Fourth Proportional to 8,920.40, 12,306.94 and 5,382.32

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Solution

The fourth proportional to 8,920.40, 12,306.94 and 5,382.32 is: 7,425.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,920.40 : 12,306.94 = 5,382.32 : x
  2. Step 2: Convert to fraction form
    8,920.40/12,306.94 = 5,382.32/x
  3. Step 3: Cross multiply
    8,920.40x = 12,306.94 × 5,382.32
  4. Step 4: Simplify right side
    8,920.40x = 66,239,814.31
  5. Step 5: Solve for x
    x = 66,239,814.31/8,920.40
  6. Step 6: Final answer
    x = 7,425.66

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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.