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Finding the Fourth Proportional to 986.96, 1,480.21 and 402.36

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Solution

The fourth proportional to 986.96, 1,480.21 and 402.36 is: 603.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.96 : 1,480.21 = 402.36 : x
  2. Step 2: Convert to fraction form
    986.96/1,480.21 = 402.36/x
  3. Step 3: Cross multiply
    986.96x = 1,480.21 × 402.36
  4. Step 4: Simplify right side
    986.96x = 595,576.29
  5. Step 5: Solve for x
    x = 595,576.29/986.96
  6. Step 6: Final answer
    x = 603.45

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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.