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Finding the Fourth Proportional to 628.52, 867.21 and 479.11

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Solution

The fourth proportional to 628.52, 867.21 and 479.11 is: 661.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.52 : 867.21 = 479.11 : x
  2. Step 2: Convert to fraction form
    628.52/867.21 = 479.11/x
  3. Step 3: Cross multiply
    628.52x = 867.21 × 479.11
  4. Step 4: Simplify right side
    628.52x = 415,486.82
  5. Step 5: Solve for x
    x = 415,486.82/628.52
  6. Step 6: Final answer
    x = 661.06

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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.