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Finding the Fourth Proportional to 12,962.55, 17,871.94 and 8,479.20

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Solution

The fourth proportional to 12,962.55, 17,871.94 and 8,479.20 is: 11,690.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,962.55 : 17,871.94 = 8,479.20 : x
  2. Step 2: Convert to fraction form
    12,962.55/17,871.94 = 8,479.20/x
  3. Step 3: Cross multiply
    12,962.55x = 17,871.94 × 8,479.20
  4. Step 4: Simplify right side
    12,962.55x = 151,539,753.65
  5. Step 5: Solve for x
    x = 151,539,753.65/12,962.55
  6. Step 6: Final answer
    x = 11,690.58

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.