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Finding the Fourth Proportional to 938.97, 1,407.11 and 690.23

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Solution

The fourth proportional to 938.97, 1,407.11 and 690.23 is: 1,034.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.97 : 1,407.11 = 690.23 : x
  2. Step 2: Convert to fraction form
    938.97/1,407.11 = 690.23/x
  3. Step 3: Cross multiply
    938.97x = 1,407.11 × 690.23
  4. Step 4: Simplify right side
    938.97x = 971,219.05
  5. Step 5: Solve for x
    x = 971,219.05/938.97
  6. Step 6: Final answer
    x = 1,034.35

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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.