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Finding the Fourth Proportional to 939.77, 1,409.99 and 574.81

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Solution

The fourth proportional to 939.77, 1,409.99 and 574.81 is: 862.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.77 : 1,409.99 = 574.81 : x
  2. Step 2: Convert to fraction form
    939.77/1,409.99 = 574.81/x
  3. Step 3: Cross multiply
    939.77x = 1,409.99 × 574.81
  4. Step 4: Simplify right side
    939.77x = 810,476.35
  5. Step 5: Solve for x
    x = 810,476.35/939.77
  6. Step 6: Final answer
    x = 862.42

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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.