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Finding the Fourth Proportional to 860, 1,291.06 and 814.64

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Solution

The fourth proportional to 860, 1,291.06 and 814.64 is: 1,222.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    860 : 1,291.06 = 814.64 : x
  2. Step 2: Convert to fraction form
    860/1,291.06 = 814.64/x
  3. Step 3: Cross multiply
    860x = 1,291.06 × 814.64
  4. Step 4: Simplify right side
    860x = 1,051,749.12
  5. Step 5: Solve for x
    x = 1,051,749.12/860
  6. Step 6: Final answer
    x = 1,222.96

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.