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Finding the Fourth Proportional to 7,920.88, 10,930.74 and 4,384

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Solution

The fourth proportional to 7,920.88, 10,930.74 and 4,384 is: 6,049.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,920.88 : 10,930.74 = 4,384 : x
  2. Step 2: Convert to fraction form
    7,920.88/10,930.74 = 4,384/x
  3. Step 3: Cross multiply
    7,920.88x = 10,930.74 × 4,384
  4. Step 4: Simplify right side
    7,920.88x = 47,920,364.16
  5. Step 5: Solve for x
    x = 47,920,364.16/7,920.88
  6. Step 6: Final answer
    x = 6,049.88

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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.