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Finding the Fourth Proportional to 371.40, 512.15 and 319.12

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Solution

The fourth proportional to 371.40, 512.15 and 319.12 is: 440.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    371.40 : 512.15 = 319.12 : x
  2. Step 2: Convert to fraction form
    371.40/512.15 = 319.12/x
  3. Step 3: Cross multiply
    371.40x = 512.15 × 319.12
  4. Step 4: Simplify right side
    371.40x = 163,437.31
  5. Step 5: Solve for x
    x = 163,437.31/371.40
  6. Step 6: Final answer
    x = 440.06

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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.