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Finding the Fourth Proportional to 7,891.68, 11,840.28 and 3,508.72

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Solution

The fourth proportional to 7,891.68, 11,840.28 and 3,508.72 is: 5,264.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,891.68 : 11,840.28 = 3,508.72 : x
  2. Step 2: Convert to fraction form
    7,891.68/11,840.28 = 3,508.72/x
  3. Step 3: Cross multiply
    7,891.68x = 11,840.28 × 3,508.72
  4. Step 4: Simplify right side
    7,891.68x = 41,544,227.24
  5. Step 5: Solve for x
    x = 41,544,227.24/7,891.68
  6. Step 6: Final answer
    x = 5,264.31

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.