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Finding the Fourth Proportional to 617.68, 926.70 and 386.20

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Solution

The fourth proportional to 617.68, 926.70 and 386.20 is: 579.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    617.68 : 926.70 = 386.20 : x
  2. Step 2: Convert to fraction form
    617.68/926.70 = 386.20/x
  3. Step 3: Cross multiply
    617.68x = 926.70 × 386.20
  4. Step 4: Simplify right side
    617.68x = 357,891.54
  5. Step 5: Solve for x
    x = 357,891.54/617.68
  6. Step 6: Final answer
    x = 579.41

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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.