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Finding the Fourth Proportional to 495.78, 742.80 and 312.75

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Solution

The fourth proportional to 495.78, 742.80 and 312.75 is: 468.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    495.78 : 742.80 = 312.75 : x
  2. Step 2: Convert to fraction form
    495.78/742.80 = 312.75/x
  3. Step 3: Cross multiply
    495.78x = 742.80 × 312.75
  4. Step 4: Simplify right side
    495.78x = 232,310.70
  5. Step 5: Solve for x
    x = 232,310.70/495.78
  6. Step 6: Final answer
    x = 468.58

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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.