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Finding the Fourth Proportional to 3,915.61, 5,873.51 and 1,318.55

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Solution

The fourth proportional to 3,915.61, 5,873.51 and 1,318.55 is: 1,977.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,915.61 : 5,873.51 = 1,318.55 : x
  2. Step 2: Convert to fraction form
    3,915.61/5,873.51 = 1,318.55/x
  3. Step 3: Cross multiply
    3,915.61x = 5,873.51 × 1,318.55
  4. Step 4: Simplify right side
    3,915.61x = 7,744,490.54
  5. Step 5: Solve for x
    x = 7,744,490.54/3,915.61
  6. Step 6: Final answer
    x = 1,977.85

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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.