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Finding the Fourth Proportional to 8,615.10, 12,915.72 and 4,919.93

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Solution

The fourth proportional to 8,615.10, 12,915.72 and 4,919.93 is: 7,375.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,615.10 : 12,915.72 = 4,919.93 : x
  2. Step 2: Convert to fraction form
    8,615.10/12,915.72 = 4,919.93/x
  3. Step 3: Cross multiply
    8,615.10x = 12,915.72 × 4,919.93
  4. Step 4: Simplify right side
    8,615.10x = 63,544,373.72
  5. Step 5: Solve for x
    x = 63,544,373.72/8,615.10
  6. Step 6: Final answer
    x = 7,375.93

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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.