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Finding the Fourth Proportional to 923.79, 1,375.62 and 913.56

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Solution

The fourth proportional to 923.79, 1,375.62 and 913.56 is: 1,360.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    923.79 : 1,375.62 = 913.56 : x
  2. Step 2: Convert to fraction form
    923.79/1,375.62 = 913.56/x
  3. Step 3: Cross multiply
    923.79x = 1,375.62 × 913.56
  4. Step 4: Simplify right side
    923.79x = 1,256,709.12
  5. Step 5: Solve for x
    x = 1,256,709.12/923.79
  6. Step 6: Final answer
    x = 1,360.39

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.