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Finding the Fourth Proportional to 356.56, 487.81 and 355.02

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Solution

The fourth proportional to 356.56, 487.81 and 355.02 is: 485.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.56 : 487.81 = 355.02 : x
  2. Step 2: Convert to fraction form
    356.56/487.81 = 355.02/x
  3. Step 3: Cross multiply
    356.56x = 487.81 × 355.02
  4. Step 4: Simplify right side
    356.56x = 173,179.87
  5. Step 5: Solve for x
    x = 173,179.87/356.56
  6. Step 6: Final answer
    x = 485.70

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.