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Finding the Fourth Proportional to 356.90, 535.56 and 140.48

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Solution

The fourth proportional to 356.90, 535.56 and 140.48 is: 210.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.90 : 535.56 = 140.48 : x
  2. Step 2: Convert to fraction form
    356.90/535.56 = 140.48/x
  3. Step 3: Cross multiply
    356.90x = 535.56 × 140.48
  4. Step 4: Simplify right side
    356.90x = 75,235.47
  5. Step 5: Solve for x
    x = 75,235.47/356.90
  6. Step 6: Final answer
    x = 210.80

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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.