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Finding the Fourth Proportional to 302.88, 418.05 and 225.12

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Solution

The fourth proportional to 302.88, 418.05 and 225.12 is: 310.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    302.88 : 418.05 = 225.12 : x
  2. Step 2: Convert to fraction form
    302.88/418.05 = 225.12/x
  3. Step 3: Cross multiply
    302.88x = 418.05 × 225.12
  4. Step 4: Simplify right side
    302.88x = 94,111.42
  5. Step 5: Solve for x
    x = 94,111.42/302.88
  6. Step 6: Final answer
    x = 310.72

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.