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Finding the Fourth Proportional to 663.65, 995.48 and 278.63

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Solution

The fourth proportional to 663.65, 995.48 and 278.63 is: 417.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.65 : 995.48 = 278.63 : x
  2. Step 2: Convert to fraction form
    663.65/995.48 = 278.63/x
  3. Step 3: Cross multiply
    663.65x = 995.48 × 278.63
  4. Step 4: Simplify right side
    663.65x = 277,364.22
  5. Step 5: Solve for x
    x = 277,364.22/663.65
  6. Step 6: Final answer
    x = 417.94

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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.