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Finding the Fourth Proportional to 302.90, 417.95 and 287.52

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Solution

The fourth proportional to 302.90, 417.95 and 287.52 is: 396.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    302.90 : 417.95 = 287.52 : x
  2. Step 2: Convert to fraction form
    302.90/417.95 = 287.52/x
  3. Step 3: Cross multiply
    302.90x = 417.95 × 287.52
  4. Step 4: Simplify right side
    302.90x = 120,167.55
  5. Step 5: Solve for x
    x = 120,167.55/302.90
  6. Step 6: Final answer
    x = 396.73

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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.