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Finding the Fourth Proportional to 479.31, 661.04 and 404.99

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Solution

The fourth proportional to 479.31, 661.04 and 404.99 is: 558.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.31 : 661.04 = 404.99 : x
  2. Step 2: Convert to fraction form
    479.31/661.04 = 404.99/x
  3. Step 3: Cross multiply
    479.31x = 661.04 × 404.99
  4. Step 4: Simplify right side
    479.31x = 267,711.28
  5. Step 5: Solve for x
    x = 267,711.28/479.31
  6. Step 6: Final answer
    x = 558.53

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.