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Finding the Fourth Proportional to 659.34, 909.58 and 438.36

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Solution

The fourth proportional to 659.34, 909.58 and 438.36 is: 604.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.34 : 909.58 = 438.36 : x
  2. Step 2: Convert to fraction form
    659.34/909.58 = 438.36/x
  3. Step 3: Cross multiply
    659.34x = 909.58 × 438.36
  4. Step 4: Simplify right side
    659.34x = 398,724.92
  5. Step 5: Solve for x
    x = 398,724.92/659.34
  6. Step 6: Final answer
    x = 604.73

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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.