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Finding the Fourth Proportional to 986.46, 1,480.28 and 885.61

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Solution

The fourth proportional to 986.46, 1,480.28 and 885.61 is: 1,328.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.46 : 1,480.28 = 885.61 : x
  2. Step 2: Convert to fraction form
    986.46/1,480.28 = 885.61/x
  3. Step 3: Cross multiply
    986.46x = 1,480.28 × 885.61
  4. Step 4: Simplify right side
    986.46x = 1,310,950.77
  5. Step 5: Solve for x
    x = 1,310,950.77/986.46
  6. Step 6: Final answer
    x = 1,328.94

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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.