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Finding the Fourth Proportional to 659.34, 988.35 and 440.15

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Solution

The fourth proportional to 659.34, 988.35 and 440.15 is: 659.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.34 : 988.35 = 440.15 : x
  2. Step 2: Convert to fraction form
    659.34/988.35 = 440.15/x
  3. Step 3: Cross multiply
    659.34x = 988.35 × 440.15
  4. Step 4: Simplify right side
    659.34x = 435,017.31
  5. Step 5: Solve for x
    x = 435,017.31/659.34
  6. Step 6: Final answer
    x = 659.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.