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Finding the Fourth Proportional to 525.71, 725.09 and 385.79

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Solution

The fourth proportional to 525.71, 725.09 and 385.79 is: 532.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    525.71 : 725.09 = 385.79 : x
  2. Step 2: Convert to fraction form
    525.71/725.09 = 385.79/x
  3. Step 3: Cross multiply
    525.71x = 725.09 × 385.79
  4. Step 4: Simplify right side
    525.71x = 279,726.92
  5. Step 5: Solve for x
    x = 279,726.92/525.71
  6. Step 6: Final answer
    x = 532.09

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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.