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Finding the Fourth Proportional to 663.38, 914.83 and 397.77

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Solution

The fourth proportional to 663.38, 914.83 and 397.77 is: 548.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.38 : 914.83 = 397.77 : x
  2. Step 2: Convert to fraction form
    663.38/914.83 = 397.77/x
  3. Step 3: Cross multiply
    663.38x = 914.83 × 397.77
  4. Step 4: Simplify right side
    663.38x = 363,894.37
  5. Step 5: Solve for x
    x = 363,894.37/663.38
  6. Step 6: Final answer
    x = 548.55

Related Problems

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.