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Finding the Fourth Proportional to 371.12, 555.98 and 319.28

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Solution

The fourth proportional to 371.12, 555.98 and 319.28 is: 478.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    371.12 : 555.98 = 319.28 : x
  2. Step 2: Convert to fraction form
    371.12/555.98 = 319.28/x
  3. Step 3: Cross multiply
    371.12x = 555.98 × 319.28
  4. Step 4: Simplify right side
    371.12x = 177,513.29
  5. Step 5: Solve for x
    x = 177,513.29/371.12
  6. Step 6: Final answer
    x = 478.32

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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.