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Finding the Fourth Proportional to 7,689.87, 11,531.16 and 3,988.40

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Solution

The fourth proportional to 7,689.87, 11,531.16 and 3,988.40 is: 5,980.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,689.87 : 11,531.16 = 3,988.40 : x
  2. Step 2: Convert to fraction form
    7,689.87/11,531.16 = 3,988.40/x
  3. Step 3: Cross multiply
    7,689.87x = 11,531.16 × 3,988.40
  4. Step 4: Simplify right side
    7,689.87x = 45,990,820.89
  5. Step 5: Solve for x
    x = 45,990,820.89/7,689.87
  6. Step 6: Final answer
    x = 5,980.70

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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.