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Finding the Fourth Proportional to 1,479.38, 2,218.74 and 439.40

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Solution

The fourth proportional to 1,479.38, 2,218.74 and 439.40 is: 659.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,479.38 : 2,218.74 = 439.40 : x
  2. Step 2: Convert to fraction form
    1,479.38/2,218.74 = 439.40/x
  3. Step 3: Cross multiply
    1,479.38x = 2,218.74 × 439.40
  4. Step 4: Simplify right side
    1,479.38x = 974,914.36
  5. Step 5: Solve for x
    x = 974,914.36/1,479.38
  6. Step 6: Final answer
    x = 659.00

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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.