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Finding the Fourth Proportional to 659.20, 909.36 and 438.16

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Solution

The fourth proportional to 659.20, 909.36 and 438.16 is: 604.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.20 : 909.36 = 438.16 : x
  2. Step 2: Convert to fraction form
    659.20/909.36 = 438.16/x
  3. Step 3: Cross multiply
    659.20x = 909.36 × 438.16
  4. Step 4: Simplify right side
    659.20x = 398,445.18
  5. Step 5: Solve for x
    x = 398,445.18/659.20
  6. Step 6: Final answer
    x = 604.44

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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.