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Finding the Fourth Proportional to 7,916.62, 11,878.13 and 2,987.67

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Solution

The fourth proportional to 7,916.62, 11,878.13 and 2,987.67 is: 4,482.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,916.62 : 11,878.13 = 2,987.67 : x
  2. Step 2: Convert to fraction form
    7,916.62/11,878.13 = 2,987.67/x
  3. Step 3: Cross multiply
    7,916.62x = 11,878.13 × 2,987.67
  4. Step 4: Simplify right side
    7,916.62x = 35,487,932.66
  5. Step 5: Solve for x
    x = 35,487,932.66/7,916.62
  6. Step 6: Final answer
    x = 4,482.71

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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.