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Finding the Fourth Proportional to 411.40, 615.66 and 266.68

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Solution

The fourth proportional to 411.40, 615.66 and 266.68 is: 399.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.40 : 615.66 = 266.68 : x
  2. Step 2: Convert to fraction form
    411.40/615.66 = 266.68/x
  3. Step 3: Cross multiply
    411.40x = 615.66 × 266.68
  4. Step 4: Simplify right side
    411.40x = 164,184.21
  5. Step 5: Solve for x
    x = 164,184.21/411.40
  6. Step 6: Final answer
    x = 399.09

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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.