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Finding the Fourth Proportional to 316, 474.20 and 145

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Solution

The fourth proportional to 316, 474.20 and 145 is: 217.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    316 : 474.20 = 145 : x
  2. Step 2: Convert to fraction form
    316/474.20 = 145/x
  3. Step 3: Cross multiply
    316x = 474.20 × 145
  4. Step 4: Simplify right side
    316x = 68,759
  5. Step 5: Solve for x
    x = 68,759/316
  6. Step 6: Final answer
    x = 217.59

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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.