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Finding the Fourth Proportional to 14,461.20, 21,691.80 and 8,629.20

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Solution

The fourth proportional to 14,461.20, 21,691.80 and 8,629.20 is: 12,943.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,461.20 : 21,691.80 = 8,629.20 : x
  2. Step 2: Convert to fraction form
    14,461.20/21,691.80 = 8,629.20/x
  3. Step 3: Cross multiply
    14,461.20x = 21,691.80 × 8,629.20
  4. Step 4: Simplify right side
    14,461.20x = 187,182,880.56
  5. Step 5: Solve for x
    x = 187,182,880.56/14,461.20
  6. Step 6: Final answer
    x = 12,943.80

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1.5x scale

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.