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Finding the Fourth Proportional to 986.70, 1,362 and 632.88

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Solution

The fourth proportional to 986.70, 1,362 and 632.88 is: 873.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.70 : 1,362 = 632.88 : x
  2. Step 2: Convert to fraction form
    986.70/1,362 = 632.88/x
  3. Step 3: Cross multiply
    986.70x = 1,362 × 632.88
  4. Step 4: Simplify right side
    986.70x = 861,982.56
  5. Step 5: Solve for x
    x = 861,982.56/986.70
  6. Step 6: Final answer
    x = 873.60

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.