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Finding the Fourth Proportional to 976.28, 1,470.26 and 856

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Solution

The fourth proportional to 976.28, 1,470.26 and 856 is: 1,289.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.28 : 1,470.26 = 856 : x
  2. Step 2: Convert to fraction form
    976.28/1,470.26 = 856/x
  3. Step 3: Cross multiply
    976.28x = 1,470.26 × 856
  4. Step 4: Simplify right side
    976.28x = 1,258,542.56
  5. Step 5: Solve for x
    x = 1,258,542.56/976.28
  6. Step 6: Final answer
    x = 1,289.12

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.