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Finding the Fourth Proportional to 8,468.22, 12,699.64 and 7,915.40

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Solution

The fourth proportional to 8,468.22, 12,699.64 and 7,915.40 is: 11,870.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,468.22 : 12,699.64 = 7,915.40 : x
  2. Step 2: Convert to fraction form
    8,468.22/12,699.64 = 7,915.40/x
  3. Step 3: Cross multiply
    8,468.22x = 12,699.64 × 7,915.40
  4. Step 4: Simplify right side
    8,468.22x = 100,522,690.88
  5. Step 5: Solve for x
    x = 100,522,690.88/8,468.22
  6. Step 6: Final answer
    x = 11,870.58

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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.