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Finding the Fourth Proportional to 1,008.49, 1,391.75 and 589.11

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Solution

The fourth proportional to 1,008.49, 1,391.75 and 589.11 is: 812.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.49 : 1,391.75 = 589.11 : x
  2. Step 2: Convert to fraction form
    1,008.49/1,391.75 = 589.11/x
  3. Step 3: Cross multiply
    1,008.49x = 1,391.75 × 589.11
  4. Step 4: Simplify right side
    1,008.49x = 819,883.94
  5. Step 5: Solve for x
    x = 819,883.94/1,008.49
  6. Step 6: Final answer
    x = 812.99

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.