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Finding the Fourth Proportional to 1,479.64, 2,219.91 and 439.64

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Solution

The fourth proportional to 1,479.64, 2,219.91 and 439.64 is: 659.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,479.64 : 2,219.91 = 439.64 : x
  2. Step 2: Convert to fraction form
    1,479.64/2,219.91 = 439.64/x
  3. Step 3: Cross multiply
    1,479.64x = 2,219.91 × 439.64
  4. Step 4: Simplify right side
    1,479.64x = 975,961.23
  5. Step 5: Solve for x
    x = 975,961.23/1,479.64
  6. Step 6: Final answer
    x = 659.59

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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.