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Finding the Fourth Proportional to 913.25, 1,369.79 and 393.23

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Solution

The fourth proportional to 913.25, 1,369.79 and 393.23 is: 589.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.25 : 1,369.79 = 393.23 : x
  2. Step 2: Convert to fraction form
    913.25/1,369.79 = 393.23/x
  3. Step 3: Cross multiply
    913.25x = 1,369.79 × 393.23
  4. Step 4: Simplify right side
    913.25x = 538,646.93
  5. Step 5: Solve for x
    x = 538,646.93/913.25
  6. Step 6: Final answer
    x = 589.81

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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.