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Finding the Fourth Proportional to 863.09, 1,294.86 and 619.79

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Solution

The fourth proportional to 863.09, 1,294.86 and 619.79 is: 929.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.09 : 1,294.86 = 619.79 : x
  2. Step 2: Convert to fraction form
    863.09/1,294.86 = 619.79/x
  3. Step 3: Cross multiply
    863.09x = 1,294.86 × 619.79
  4. Step 4: Simplify right side
    863.09x = 802,534.81
  5. Step 5: Solve for x
    x = 802,534.81/863.09
  6. Step 6: Final answer
    x = 929.84

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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.