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Finding the Fourth Proportional to 1,008.90, 1,392.25 and 589.28

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Solution

The fourth proportional to 1,008.90, 1,392.25 and 589.28 is: 813.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.90 : 1,392.25 = 589.28 : x
  2. Step 2: Convert to fraction form
    1,008.90/1,392.25 = 589.28/x
  3. Step 3: Cross multiply
    1,008.90x = 1,392.25 × 589.28
  4. Step 4: Simplify right side
    1,008.90x = 820,425.08
  5. Step 5: Solve for x
    x = 820,425.08/1,008.90
  6. Step 6: Final answer
    x = 813.19

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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.