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Finding the Fourth Proportional to 7,876.88, 10,869.76 and 4,339.72

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Solution

The fourth proportional to 7,876.88, 10,869.76 and 4,339.72 is: 5,988.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,876.88 : 10,869.76 = 4,339.72 : x
  2. Step 2: Convert to fraction form
    7,876.88/10,869.76 = 4,339.72/x
  3. Step 3: Cross multiply
    7,876.88x = 10,869.76 × 4,339.72
  4. Step 4: Simplify right side
    7,876.88x = 47,171,714.87
  5. Step 5: Solve for x
    x = 47,171,714.87/7,876.88
  6. Step 6: Final answer
    x = 5,988.63

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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.