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Finding the Fourth Proportional to 18,479.20, 27,718.80 and 5,330.40

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Solution

The fourth proportional to 18,479.20, 27,718.80 and 5,330.40 is: 7,995.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,479.20 : 27,718.80 = 5,330.40 : x
  2. Step 2: Convert to fraction form
    18,479.20/27,718.80 = 5,330.40/x
  3. Step 3: Cross multiply
    18,479.20x = 27,718.80 × 5,330.40
  4. Step 4: Simplify right side
    18,479.20x = 147,752,291.52
  5. Step 5: Solve for x
    x = 147,752,291.52/18,479.20
  6. Step 6: Final answer
    x = 7,995.60

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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.