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Finding the Fourth Proportional to 986.31, 1,479.49 and 401.59

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Solution

The fourth proportional to 986.31, 1,479.49 and 401.59 is: 602.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.31 : 1,479.49 = 401.59 : x
  2. Step 2: Convert to fraction form
    986.31/1,479.49 = 401.59/x
  3. Step 3: Cross multiply
    986.31x = 1,479.49 × 401.59
  4. Step 4: Simplify right side
    986.31x = 594,148.39
  5. Step 5: Solve for x
    x = 594,148.39/986.31
  6. Step 6: Final answer
    x = 602.40

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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.