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Finding the Fourth Proportional to 302.96, 454.52 and 140.78

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Solution

The fourth proportional to 302.96, 454.52 and 140.78 is: 211.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    302.96 : 454.52 = 140.78 : x
  2. Step 2: Convert to fraction form
    302.96/454.52 = 140.78/x
  3. Step 3: Cross multiply
    302.96x = 454.52 × 140.78
  4. Step 4: Simplify right side
    302.96x = 63,985.40
  5. Step 5: Solve for x
    x = 63,985.40/302.96
  6. Step 6: Final answer
    x = 211.20

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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.