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Finding the Fourth Proportional to 659.42, 909.64 and 449.58

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Solution

The fourth proportional to 659.42, 909.64 and 449.58 is: 620.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.42 : 909.64 = 449.58 : x
  2. Step 2: Convert to fraction form
    659.42/909.64 = 449.58/x
  3. Step 3: Cross multiply
    659.42x = 909.64 × 449.58
  4. Step 4: Simplify right side
    659.42x = 408,955.95
  5. Step 5: Solve for x
    x = 408,955.95/659.42
  6. Step 6: Final answer
    x = 620.18

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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.