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Finding the Fourth Proportional to 663.90, 995.82 and 317.48

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Solution

The fourth proportional to 663.90, 995.82 and 317.48 is: 476.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.90 : 995.82 = 317.48 : x
  2. Step 2: Convert to fraction form
    663.90/995.82 = 317.48/x
  3. Step 3: Cross multiply
    663.90x = 995.82 × 317.48
  4. Step 4: Simplify right side
    663.90x = 316,146.76
  5. Step 5: Solve for x
    x = 316,146.76/663.90
  6. Step 6: Final answer
    x = 476.20

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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.