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Finding the Fourth Proportional to 663.78, 916.02 and 369.05

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Solution

The fourth proportional to 663.78, 916.02 and 369.05 is: 509.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.78 : 916.02 = 369.05 : x
  2. Step 2: Convert to fraction form
    663.78/916.02 = 369.05/x
  3. Step 3: Cross multiply
    663.78x = 916.02 × 369.05
  4. Step 4: Simplify right side
    663.78x = 338,052.60
  5. Step 5: Solve for x
    x = 338,052.60/663.78
  6. Step 6: Final answer
    x = 509.28

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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.