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Finding the Fourth Proportional to 725.78, 1,086.84 and 509.51

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Solution

The fourth proportional to 725.78, 1,086.84 and 509.51 is: 762.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.78 : 1,086.84 = 509.51 : x
  2. Step 2: Convert to fraction form
    725.78/1,086.84 = 509.51/x
  3. Step 3: Cross multiply
    725.78x = 1,086.84 × 509.51
  4. Step 4: Simplify right side
    725.78x = 553,750.41
  5. Step 5: Solve for x
    x = 553,750.41/725.78
  6. Step 6: Final answer
    x = 762.98

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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.