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Finding the Fourth Proportional to 786.92, 1,086.40 and 521.72

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Solution

The fourth proportional to 786.92, 1,086.40 and 521.72 is: 720.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.92 : 1,086.40 = 521.72 : x
  2. Step 2: Convert to fraction form
    786.92/1,086.40 = 521.72/x
  3. Step 3: Cross multiply
    786.92x = 1,086.40 × 521.72
  4. Step 4: Simplify right side
    786.92x = 566,799.16
  5. Step 5: Solve for x
    x = 566,799.16/786.92
  6. Step 6: Final answer
    x = 720.27

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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.