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Finding the Fourth Proportional to 12,253.20, 18,380.40 and 6,421.20

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Solution

The fourth proportional to 12,253.20, 18,380.40 and 6,421.20 is: 9,632.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,253.20 : 18,380.40 = 6,421.20 : x
  2. Step 2: Convert to fraction form
    12,253.20/18,380.40 = 6,421.20/x
  3. Step 3: Cross multiply
    12,253.20x = 18,380.40 × 6,421.20
  4. Step 4: Simplify right side
    12,253.20x = 118,024,224.48
  5. Step 5: Solve for x
    x = 118,024,224.48/12,253.20
  6. Step 6: Final answer
    x = 9,632.11

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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.