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Finding the Fourth Proportional to 913.09, 1,369.00 and 319.97

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Solution

The fourth proportional to 913.09, 1,369.00 and 319.97 is: 479.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.09 : 1,369.00 = 319.97 : x
  2. Step 2: Convert to fraction form
    913.09/1,369.00 = 319.97/x
  3. Step 3: Cross multiply
    913.09x = 1,369.00 × 319.97
  4. Step 4: Simplify right side
    913.09x = 438,034.71
  5. Step 5: Solve for x
    x = 438,034.71/913.09
  6. Step 6: Final answer
    x = 479.73

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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.