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Finding the Fourth Proportional to 989.42, 1,476.10 and 891

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Solution

The fourth proportional to 989.42, 1,476.10 and 891 is: 1,329.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.42 : 1,476.10 = 891 : x
  2. Step 2: Convert to fraction form
    989.42/1,476.10 = 891/x
  3. Step 3: Cross multiply
    989.42x = 1,476.10 × 891
  4. Step 4: Simplify right side
    989.42x = 1,315,205.10
  5. Step 5: Solve for x
    x = 1,315,205.10/989.42
  6. Step 6: Final answer
    x = 1,329.27

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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.