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Finding the Fourth Proportional to 690.38, 1,035.68 and 257.44

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Solution

The fourth proportional to 690.38, 1,035.68 and 257.44 is: 386.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.38 : 1,035.68 = 257.44 : x
  2. Step 2: Convert to fraction form
    690.38/1,035.68 = 257.44/x
  3. Step 3: Cross multiply
    690.38x = 1,035.68 × 257.44
  4. Step 4: Simplify right side
    690.38x = 266,625.46
  5. Step 5: Solve for x
    x = 266,625.46/690.38
  6. Step 6: Final answer
    x = 386.20

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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.