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Finding the Fourth Proportional to 371.56, 511.70 and 354.28

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Solution

The fourth proportional to 371.56, 511.70 and 354.28 is: 487.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    371.56 : 511.70 = 354.28 : x
  2. Step 2: Convert to fraction form
    371.56/511.70 = 354.28/x
  3. Step 3: Cross multiply
    371.56x = 511.70 × 354.28
  4. Step 4: Simplify right side
    371.56x = 181,285.08
  5. Step 5: Solve for x
    x = 181,285.08/371.56
  6. Step 6: Final answer
    x = 487.90

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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.