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Finding the Fourth Proportional to 938.93, 1,408.80 and 614.93

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Solution

The fourth proportional to 938.93, 1,408.80 and 614.93 is: 922.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.93 : 1,408.80 = 614.93 : x
  2. Step 2: Convert to fraction form
    938.93/1,408.80 = 614.93/x
  3. Step 3: Cross multiply
    938.93x = 1,408.80 × 614.93
  4. Step 4: Simplify right side
    938.93x = 866,313.38
  5. Step 5: Solve for x
    x = 866,313.38/938.93
  6. Step 6: Final answer
    x = 922.66

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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.