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Finding the Fourth Proportional to 1,001.15, 1,379.88 and 685.85

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Solution

The fourth proportional to 1,001.15, 1,379.88 and 685.85 is: 945.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,001.15 : 1,379.88 = 685.85 : x
  2. Step 2: Convert to fraction form
    1,001.15/1,379.88 = 685.85/x
  3. Step 3: Cross multiply
    1,001.15x = 1,379.88 × 685.85
  4. Step 4: Simplify right side
    1,001.15x = 946,394.15
  5. Step 5: Solve for x
    x = 946,394.15/1,001.15
  6. Step 6: Final answer
    x = 945.31

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1.5x scale

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.