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Finding the Fourth Proportional to 986.72, 1,480.07 and 926.57

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Solution

The fourth proportional to 986.72, 1,480.07 and 926.57 is: 1,389.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.72 : 1,480.07 = 926.57 : x
  2. Step 2: Convert to fraction form
    986.72/1,480.07 = 926.57/x
  3. Step 3: Cross multiply
    986.72x = 1,480.07 × 926.57
  4. Step 4: Simplify right side
    986.72x = 1,371,388.46
  5. Step 5: Solve for x
    x = 1,371,388.46/986.72
  6. Step 6: Final answer
    x = 1,389.85

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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.