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Finding the Fourth Proportional to 302.75, 454.13 and 74.75

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Solution

The fourth proportional to 302.75, 454.13 and 74.75 is: 112.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    302.75 : 454.13 = 74.75 : x
  2. Step 2: Convert to fraction form
    302.75/454.13 = 74.75/x
  3. Step 3: Cross multiply
    302.75x = 454.13 × 74.75
  4. Step 4: Simplify right side
    302.75x = 33,946.22
  5. Step 5: Solve for x
    x = 33,946.22/302.75
  6. Step 6: Final answer
    x = 112.13

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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.