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Finding the Fourth Proportional to 663.91, 916.18 and 369.19

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Solution

The fourth proportional to 663.91, 916.18 and 369.19 is: 509.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.91 : 916.18 = 369.19 : x
  2. Step 2: Convert to fraction form
    663.91/916.18 = 369.19/x
  3. Step 3: Cross multiply
    663.91x = 916.18 × 369.19
  4. Step 4: Simplify right side
    663.91x = 338,244.49
  5. Step 5: Solve for x
    x = 338,244.49/663.91
  6. Step 6: Final answer
    x = 509.47

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Double scale
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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.