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Finding the Fourth Proportional to 1,016.45, 1,402.11 and 685.33

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Solution

The fourth proportional to 1,016.45, 1,402.11 and 685.33 is: 945.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,016.45 : 1,402.11 = 685.33 : x
  2. Step 2: Convert to fraction form
    1,016.45/1,402.11 = 685.33/x
  3. Step 3: Cross multiply
    1,016.45x = 1,402.11 × 685.33
  4. Step 4: Simplify right side
    1,016.45x = 960,908.05
  5. Step 5: Solve for x
    x = 960,908.05/1,016.45
  6. Step 6: Final answer
    x = 945.36

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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.