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Finding the Fourth Proportional to 988.90, 1,363.90 and 922.66

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Solution

The fourth proportional to 988.90, 1,363.90 and 922.66 is: 1,272.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.90 : 1,363.90 = 922.66 : x
  2. Step 2: Convert to fraction form
    988.90/1,363.90 = 922.66/x
  3. Step 3: Cross multiply
    988.90x = 1,363.90 × 922.66
  4. Step 4: Simplify right side
    988.90x = 1,258,406.85
  5. Step 5: Solve for x
    x = 1,258,406.85/988.90
  6. Step 6: Final answer
    x = 1,272.54

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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.