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Finding the Fourth Proportional to 390.11, 584.61 and 266.60

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Solution

The fourth proportional to 390.11, 584.61 and 266.60 is: 399.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.11 : 584.61 = 266.60 : x
  2. Step 2: Convert to fraction form
    390.11/584.61 = 266.60/x
  3. Step 3: Cross multiply
    390.11x = 584.61 × 266.60
  4. Step 4: Simplify right side
    390.11x = 155,857.03
  5. Step 5: Solve for x
    x = 155,857.03/390.11
  6. Step 6: Final answer
    x = 399.52

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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.