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Finding the Fourth Proportional to 385.12, 531.12 and 266.91

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Solution

The fourth proportional to 385.12, 531.12 and 266.91 is: 368.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.12 : 531.12 = 266.91 : x
  2. Step 2: Convert to fraction form
    385.12/531.12 = 266.91/x
  3. Step 3: Cross multiply
    385.12x = 531.12 × 266.91
  4. Step 4: Simplify right side
    385.12x = 141,761.24
  5. Step 5: Solve for x
    x = 141,761.24/385.12
  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.