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Finding the Fourth Proportional to 374.78, 517.56 and 354.33

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Solution

The fourth proportional to 374.78, 517.56 and 354.33 is: 489.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    374.78 : 517.56 = 354.33 : x
  2. Step 2: Convert to fraction form
    374.78/517.56 = 354.33/x
  3. Step 3: Cross multiply
    374.78x = 517.56 × 354.33
  4. Step 4: Simplify right side
    374.78x = 183,385.71
  5. Step 5: Solve for x
    x = 183,385.71/374.78
  6. Step 6: Final answer
    x = 489.31

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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.