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Finding the Fourth Proportional to 301.20, 451.65 and 138.70

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Solution

The fourth proportional to 301.20, 451.65 and 138.70 is: 207.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    301.20 : 451.65 = 138.70 : x
  2. Step 2: Convert to fraction form
    301.20/451.65 = 138.70/x
  3. Step 3: Cross multiply
    301.20x = 451.65 × 138.70
  4. Step 4: Simplify right side
    301.20x = 62,643.86
  5. Step 5: Solve for x
    x = 62,643.86/301.20
  6. Step 6: Final answer
    x = 207.98

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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.