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Finding the Fourth Proportional to 316.21, 472.95 and 258.82

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Solution

The fourth proportional to 316.21, 472.95 and 258.82 is: 387.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.21 : 472.95 = 258.82 : x
  2. Step 2: Convert to fraction form
    316.21/472.95 = 258.82/x
  3. Step 3: Cross multiply
    316.21x = 472.95 × 258.82
  4. Step 4: Simplify right side
    316.21x = 122,408.92
  5. Step 5: Solve for x
    x = 122,408.92/316.21
  6. Step 6: Final answer
    x = 387.11

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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.