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Finding the Fourth Proportional to 1,125.75, 1,688.81 and 395.53

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Solution

The fourth proportional to 1,125.75, 1,688.81 and 395.53 is: 593.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.75 : 1,688.81 = 395.53 : x
  2. Step 2: Convert to fraction form
    1,125.75/1,688.81 = 395.53/x
  3. Step 3: Cross multiply
    1,125.75x = 1,688.81 × 395.53
  4. Step 4: Simplify right side
    1,125.75x = 667,975.02
  5. Step 5: Solve for x
    x = 667,975.02/1,125.75
  6. Step 6: Final answer
    x = 593.36

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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.