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Finding the Fourth Proportional to 1,008.66, 1,390.92 and 728.34

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Solution

The fourth proportional to 1,008.66, 1,390.92 and 728.34 is: 1,004.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.66 : 1,390.92 = 728.34 : x
  2. Step 2: Convert to fraction form
    1,008.66/1,390.92 = 728.34/x
  3. Step 3: Cross multiply
    1,008.66x = 1,390.92 × 728.34
  4. Step 4: Simplify right side
    1,008.66x = 1,013,062.67
  5. Step 5: Solve for x
    x = 1,013,062.67/1,008.66
  6. Step 6: Final answer
    x = 1,004.36

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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.