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Finding the Fourth Proportional to 495.30, 743.22 and 312.78

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Solution

The fourth proportional to 495.30, 743.22 and 312.78 is: 469.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    495.30 : 743.22 = 312.78 : x
  2. Step 2: Convert to fraction form
    495.30/743.22 = 312.78/x
  3. Step 3: Cross multiply
    495.30x = 743.22 × 312.78
  4. Step 4: Simplify right side
    495.30x = 232,464.35
  5. Step 5: Solve for x
    x = 232,464.35/495.30
  6. Step 6: Final answer
    x = 469.34

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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.