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Finding the Fourth Proportional to 355.72, 487.71 and 349.60

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Solution

The fourth proportional to 355.72, 487.71 and 349.60 is: 479.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.72 : 487.71 = 349.60 : x
  2. Step 2: Convert to fraction form
    355.72/487.71 = 349.60/x
  3. Step 3: Cross multiply
    355.72x = 487.71 × 349.60
  4. Step 4: Simplify right side
    355.72x = 170,503.42
  5. Step 5: Solve for x
    x = 170,503.42/355.72
  6. Step 6: Final answer
    x = 479.32

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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.