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Finding the Fourth Proportional to 1,008.35, 1,390.05 and 708.65

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Solution

The fourth proportional to 1,008.35, 1,390.05 and 708.65 is: 976.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.35 : 1,390.05 = 708.65 : x
  2. Step 2: Convert to fraction form
    1,008.35/1,390.05 = 708.65/x
  3. Step 3: Cross multiply
    1,008.35x = 1,390.05 × 708.65
  4. Step 4: Simplify right side
    1,008.35x = 985,058.93
  5. Step 5: Solve for x
    x = 985,058.93/1,008.35
  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.