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Finding the Fourth Proportional to 438.81, 658.14 and 130.69

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Solution

The fourth proportional to 438.81, 658.14 and 130.69 is: 196.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.81 : 658.14 = 130.69 : x
  2. Step 2: Convert to fraction form
    438.81/658.14 = 130.69/x
  3. Step 3: Cross multiply
    438.81x = 658.14 × 130.69
  4. Step 4: Simplify right side
    438.81x = 86,012.32
  5. Step 5: Solve for x
    x = 86,012.32/438.81
  6. Step 6: Final answer
    x = 196.01

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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.