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Finding the Fourth Proportional to 986.18, 1,472.67 and 918.14

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Solution

The fourth proportional to 986.18, 1,472.67 and 918.14 is: 1,371.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.18 : 1,472.67 = 918.14 : x
  2. Step 2: Convert to fraction form
    986.18/1,472.67 = 918.14/x
  3. Step 3: Cross multiply
    986.18x = 1,472.67 × 918.14
  4. Step 4: Simplify right side
    986.18x = 1,352,112.64
  5. Step 5: Solve for x
    x = 1,352,112.64/986.18
  6. Step 6: Final answer
    x = 1,371.06

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.