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Finding the Fourth Proportional to 15,136.20, 20,886.84 and 8,421.66

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Solution

The fourth proportional to 15,136.20, 20,886.84 and 8,421.66 is: 11,621.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,136.20 : 20,886.84 = 8,421.66 : x
  2. Step 2: Convert to fraction form
    15,136.20/20,886.84 = 8,421.66/x
  3. Step 3: Cross multiply
    15,136.20x = 20,886.84 × 8,421.66
  4. Step 4: Simplify right side
    15,136.20x = 175,901,864.95
  5. Step 5: Solve for x
    x = 175,901,864.95/15,136.20
  6. Step 6: Final answer
    x = 11,621.27

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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.