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Finding the Fourth Proportional to 725.87, 1,087.85 and 340.31

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Solution

The fourth proportional to 725.87, 1,087.85 and 340.31 is: 510.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.87 : 1,087.85 = 340.31 : x
  2. Step 2: Convert to fraction form
    725.87/1,087.85 = 340.31/x
  3. Step 3: Cross multiply
    725.87x = 1,087.85 × 340.31
  4. Step 4: Simplify right side
    725.87x = 370,204.53
  5. Step 5: Solve for x
    x = 370,204.53/725.87
  6. Step 6: Final answer
    x = 510.01

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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.