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Finding the Fourth Proportional to 690.98, 1,036.92 and 635.36

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Solution

The fourth proportional to 690.98, 1,036.92 and 635.36 is: 953.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.98 : 1,036.92 = 635.36 : x
  2. Step 2: Convert to fraction form
    690.98/1,036.92 = 635.36/x
  3. Step 3: Cross multiply
    690.98x = 1,036.92 × 635.36
  4. Step 4: Simplify right side
    690.98x = 658,817.49
  5. Step 5: Solve for x
    x = 658,817.49/690.98
  6. Step 6: Final answer
    x = 953.45

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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.