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Finding the Fourth Proportional to 3,712.81, 5,569.07 and 939.45

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Solution

The fourth proportional to 3,712.81, 5,569.07 and 939.45 is: 1,409.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,712.81 : 5,569.07 = 939.45 : x
  2. Step 2: Convert to fraction form
    3,712.81/5,569.07 = 939.45/x
  3. Step 3: Cross multiply
    3,712.81x = 5,569.07 × 939.45
  4. Step 4: Simplify right side
    3,712.81x = 5,231,851.24
  5. Step 5: Solve for x
    x = 5,231,851.24/3,712.81
  6. Step 6: Final answer
    x = 1,409.13

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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.