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Finding the Fourth Proportional to 986.90, 1,480.17 and 401.99

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Solution

The fourth proportional to 986.90, 1,480.17 and 401.99 is: 602.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.90 : 1,480.17 = 401.99 : x
  2. Step 2: Convert to fraction form
    986.90/1,480.17 = 401.99/x
  3. Step 3: Cross multiply
    986.90x = 1,480.17 × 401.99
  4. Step 4: Simplify right side
    986.90x = 595,013.54
  5. Step 5: Solve for x
    x = 595,013.54/986.90
  6. Step 6: Final answer
    x = 602.91

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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.