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Finding the Fourth Proportional to 9,920.88, 13,689.27 and 6,388.88

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Solution

The fourth proportional to 9,920.88, 13,689.27 and 6,388.88 is: 8,815.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,920.88 : 13,689.27 = 6,388.88 : x
  2. Step 2: Convert to fraction form
    9,920.88/13,689.27 = 6,388.88/x
  3. Step 3: Cross multiply
    9,920.88x = 13,689.27 × 6,388.88
  4. Step 4: Simplify right side
    9,920.88x = 87,459,034.87
  5. Step 5: Solve for x
    x = 87,459,034.87/9,920.88
  6. Step 6: Final answer
    x = 8,815.65

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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.