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Finding the Fourth Proportional to 617.30, 923.79 and 386.30

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Solution

The fourth proportional to 617.30, 923.79 and 386.30 is: 578.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    617.30 : 923.79 = 386.30 : x
  2. Step 2: Convert to fraction form
    617.30/923.79 = 386.30/x
  3. Step 3: Cross multiply
    617.30x = 923.79 × 386.30
  4. Step 4: Simplify right side
    617.30x = 356,860.08
  5. Step 5: Solve for x
    x = 356,860.08/617.30
  6. Step 6: Final answer
    x = 578.10

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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.