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Finding the Fourth Proportional to 14,957.20, 20,640.80 and 8,242.72

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Solution

The fourth proportional to 14,957.20, 20,640.80 and 8,242.72 is: 11,374.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,957.20 : 20,640.80 = 8,242.72 : x
  2. Step 2: Convert to fraction form
    14,957.20/20,640.80 = 8,242.72/x
  3. Step 3: Cross multiply
    14,957.20x = 20,640.80 × 8,242.72
  4. Step 4: Simplify right side
    14,957.20x = 170,136,334.98
  5. Step 5: Solve for x
    x = 170,136,334.98/14,957.20
  6. Step 6: Final answer
    x = 11,374.88

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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.