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Finding the Fourth Proportional to 291.41, 402.20 and 266.70

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Solution

The fourth proportional to 291.41, 402.20 and 266.70 is: 368.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.41 : 402.20 = 266.70 : x
  2. Step 2: Convert to fraction form
    291.41/402.20 = 266.70/x
  3. Step 3: Cross multiply
    291.41x = 402.20 × 266.70
  4. Step 4: Simplify right side
    291.41x = 107,266.74
  5. Step 5: Solve for x
    x = 107,266.74/291.41
  6. Step 6: Final answer
    x = 368.10

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.