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Finding the Fourth Proportional to 1,008.90, 1,392.12 and 610.38

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Solution

The fourth proportional to 1,008.90, 1,392.12 and 610.38 is: 842.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.90 : 1,392.12 = 610.38 : x
  2. Step 2: Convert to fraction form
    1,008.90/1,392.12 = 610.38/x
  3. Step 3: Cross multiply
    1,008.90x = 1,392.12 × 610.38
  4. Step 4: Simplify right side
    1,008.90x = 849,722.21
  5. Step 5: Solve for x
    x = 849,722.21/1,008.90
  6. Step 6: Final answer
    x = 842.23

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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.