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Finding the Fourth Proportional to 618.78, 923.65 and 540.93

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Solution

The fourth proportional to 618.78, 923.65 and 540.93 is: 807.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.78 : 923.65 = 540.93 : x
  2. Step 2: Convert to fraction form
    618.78/923.65 = 540.93/x
  3. Step 3: Cross multiply
    618.78x = 923.65 × 540.93
  4. Step 4: Simplify right side
    618.78x = 499,629.99
  5. Step 5: Solve for x
    x = 499,629.99/618.78
  6. Step 6: Final answer
    x = 807.44

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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.