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Finding the Fourth Proportional to 976.08, 1,346.28 and 681.42

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Solution

The fourth proportional to 976.08, 1,346.28 and 681.42 is: 939.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.08 : 1,346.28 = 681.42 : x
  2. Step 2: Convert to fraction form
    976.08/1,346.28 = 681.42/x
  3. Step 3: Cross multiply
    976.08x = 1,346.28 × 681.42
  4. Step 4: Simplify right side
    976.08x = 917,382.12
  5. Step 5: Solve for x
    x = 917,382.12/976.08
  6. Step 6: Final answer
    x = 939.86

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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.