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Finding the Fourth Proportional to 1,110.89, 1,673.87 and 920.13

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Solution

The fourth proportional to 1,110.89, 1,673.87 and 920.13 is: 1,386.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,110.89 : 1,673.87 = 920.13 : x
  2. Step 2: Convert to fraction form
    1,110.89/1,673.87 = 920.13/x
  3. Step 3: Cross multiply
    1,110.89x = 1,673.87 × 920.13
  4. Step 4: Simplify right side
    1,110.89x = 1,540,173.40
  5. Step 5: Solve for x
    x = 1,540,173.40/1,110.89
  6. Step 6: Final answer
    x = 1,386.44

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.