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Finding the Fourth Proportional to 659.60, 910.61 and 438.88

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Solution

The fourth proportional to 659.60, 910.61 and 438.88 is: 605.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.60 : 910.61 = 438.88 : x
  2. Step 2: Convert to fraction form
    659.60/910.61 = 438.88/x
  3. Step 3: Cross multiply
    659.60x = 910.61 × 438.88
  4. Step 4: Simplify right side
    659.60x = 399,645.06
  5. Step 5: Solve for x
    x = 399,645.06/659.60
  6. Step 6: Final answer
    x = 605.89

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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.