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Finding the Fourth Proportional to 663.69, 995.59 and 317.18

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Solution

The fourth proportional to 663.69, 995.59 and 317.18 is: 475.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.69 : 995.59 = 317.18 : x
  2. Step 2: Convert to fraction form
    663.69/995.59 = 317.18/x
  3. Step 3: Cross multiply
    663.69x = 995.59 × 317.18
  4. Step 4: Simplify right side
    663.69x = 315,784.12
  5. Step 5: Solve for x
    x = 315,784.12/663.69
  6. Step 6: Final answer
    x = 475.80

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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.