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Finding the Fourth Proportional to 438.12, 659.88 and 427.19

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Solution

The fourth proportional to 438.12, 659.88 and 427.19 is: 643.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.12 : 659.88 = 427.19 : x
  2. Step 2: Convert to fraction form
    438.12/659.88 = 427.19/x
  3. Step 3: Cross multiply
    438.12x = 659.88 × 427.19
  4. Step 4: Simplify right side
    438.12x = 281,890.84
  5. Step 5: Solve for x
    x = 281,890.84/438.12
  6. Step 6: Final answer
    x = 643.41

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.