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Finding the Fourth Proportional to 1,008.36, 1,390.04 and 708.66

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Solution

The fourth proportional to 1,008.36, 1,390.04 and 708.66 is: 976.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.36 : 1,390.04 = 708.66 : x
  2. Step 2: Convert to fraction form
    1,008.36/1,390.04 = 708.66/x
  3. Step 3: Cross multiply
    1,008.36x = 1,390.04 × 708.66
  4. Step 4: Simplify right side
    1,008.36x = 985,065.75
  5. Step 5: Solve for x
    x = 985,065.75/1,008.36
  6. Step 6: Final answer
    x = 976.90

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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.