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Finding the Fourth Proportional to 335.76, 503.72 and 140.78

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Solution

The fourth proportional to 335.76, 503.72 and 140.78 is: 211.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    335.76 : 503.72 = 140.78 : x
  2. Step 2: Convert to fraction form
    335.76/503.72 = 140.78/x
  3. Step 3: Cross multiply
    335.76x = 503.72 × 140.78
  4. Step 4: Simplify right side
    335.76x = 70,913.70
  5. Step 5: Solve for x
    x = 70,913.70/335.76
  6. Step 6: Final answer
    x = 211.20

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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.