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Finding the Fourth Proportional to 690.41, 1,036.05 and 398.29

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Solution

The fourth proportional to 690.41, 1,036.05 and 398.29 is: 597.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.41 : 1,036.05 = 398.29 : x
  2. Step 2: Convert to fraction form
    690.41/1,036.05 = 398.29/x
  3. Step 3: Cross multiply
    690.41x = 1,036.05 × 398.29
  4. Step 4: Simplify right side
    690.41x = 412,648.35
  5. Step 5: Solve for x
    x = 412,648.35/690.41
  6. Step 6: Final answer
    x = 597.69

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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.