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Finding the Fourth Proportional to 438.88, 659.18 and 419.74

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Solution

The fourth proportional to 438.88, 659.18 and 419.74 is: 630.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.88 : 659.18 = 419.74 : x
  2. Step 2: Convert to fraction form
    438.88/659.18 = 419.74/x
  3. Step 3: Cross multiply
    438.88x = 659.18 × 419.74
  4. Step 4: Simplify right side
    438.88x = 276,685.30
  5. Step 5: Solve for x
    x = 276,685.30/438.88
  6. Step 6: Final answer
    x = 630.43

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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.