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Finding the Fourth Proportional to 385.53, 531.49 and 260.99

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Solution

The fourth proportional to 385.53, 531.49 and 260.99 is: 359.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.53 : 531.49 = 260.99 : x
  2. Step 2: Convert to fraction form
    385.53/531.49 = 260.99/x
  3. Step 3: Cross multiply
    385.53x = 531.49 × 260.99
  4. Step 4: Simplify right side
    385.53x = 138,709.61
  5. Step 5: Solve for x
    x = 138,709.61/385.53
  6. Step 6: Final answer
    x = 359.79

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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.