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Finding the Fourth Proportional to 1,003.89, 1,386.17 and 668.12

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Solution

The fourth proportional to 1,003.89, 1,386.17 and 668.12 is: 922.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,003.89 : 1,386.17 = 668.12 : x
  2. Step 2: Convert to fraction form
    1,003.89/1,386.17 = 668.12/x
  3. Step 3: Cross multiply
    1,003.89x = 1,386.17 × 668.12
  4. Step 4: Simplify right side
    1,003.89x = 926,117.63
  5. Step 5: Solve for x
    x = 926,117.63/1,003.89
  6. Step 6: Final answer
    x = 922.53

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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.