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Finding the Fourth Proportional to 12,153.20, 18,230.40 and 6,321.20

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Solution

The fourth proportional to 12,153.20, 18,230.40 and 6,321.20 is: 9,482.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,153.20 : 18,230.40 = 6,321.20 : x
  2. Step 2: Convert to fraction form
    12,153.20/18,230.40 = 6,321.20/x
  3. Step 3: Cross multiply
    12,153.20x = 18,230.40 × 6,321.20
  4. Step 4: Simplify right side
    12,153.20x = 115,238,004.48
  5. Step 5: Solve for x
    x = 115,238,004.48/12,153.20
  6. Step 6: Final answer
    x = 9,482.11

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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.