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Finding the Fourth Proportional to 863.38, 1,289.12 and 708.81

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Solution

The fourth proportional to 863.38, 1,289.12 and 708.81 is: 1,058.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.38 : 1,289.12 = 708.81 : x
  2. Step 2: Convert to fraction form
    863.38/1,289.12 = 708.81/x
  3. Step 3: Cross multiply
    863.38x = 1,289.12 × 708.81
  4. Step 4: Simplify right side
    863.38x = 913,741.15
  5. Step 5: Solve for x
    x = 913,741.15/863.38
  6. Step 6: Final answer
    x = 1,058.33

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.