Home / 12,423.28-18,618.40-9,120.88

Finding the Fourth Proportional to 12,423.28, 18,618.40 and 9,120.88

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Solution

The fourth proportional to 12,423.28, 18,618.40 and 9,120.88 is: 13,669.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,423.28 : 18,618.40 = 9,120.88 : x
  2. Step 2: Convert to fraction form
    12,423.28/18,618.40 = 9,120.88/x
  3. Step 3: Cross multiply
    12,423.28x = 18,618.40 × 9,120.88
  4. Step 4: Simplify right side
    12,423.28x = 169,816,192.19
  5. Step 5: Solve for x
    x = 169,816,192.19/12,423.28
  6. Step 6: Final answer
    x = 13,669.19

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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.