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Finding the Fourth Proportional to 690.63, 1,036.09 and 365.91

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Solution

The fourth proportional to 690.63, 1,036.09 and 365.91 is: 548.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.63 : 1,036.09 = 365.91 : x
  2. Step 2: Convert to fraction form
    690.63/1,036.09 = 365.91/x
  3. Step 3: Cross multiply
    690.63x = 1,036.09 × 365.91
  4. Step 4: Simplify right side
    690.63x = 379,114.78
  5. Step 5: Solve for x
    x = 379,114.78/690.63
  6. Step 6: Final answer
    x = 548.94

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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.