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Finding the Fourth Proportional to 690.64, 1,036.56 and 401.68

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Solution

The fourth proportional to 690.64, 1,036.56 and 401.68 is: 602.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.64 : 1,036.56 = 401.68 : x
  2. Step 2: Convert to fraction form
    690.64/1,036.56 = 401.68/x
  3. Step 3: Cross multiply
    690.64x = 1,036.56 × 401.68
  4. Step 4: Simplify right side
    690.64x = 416,365.42
  5. Step 5: Solve for x
    x = 416,365.42/690.64
  6. Step 6: Final answer
    x = 602.87

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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.