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Finding the Fourth Proportional to 863.08, 1,189.04 and 715.25

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Solution

The fourth proportional to 863.08, 1,189.04 and 715.25 is: 985.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.08 : 1,189.04 = 715.25 : x
  2. Step 2: Convert to fraction form
    863.08/1,189.04 = 715.25/x
  3. Step 3: Cross multiply
    863.08x = 1,189.04 × 715.25
  4. Step 4: Simplify right side
    863.08x = 850,460.26
  5. Step 5: Solve for x
    x = 850,460.26/863.08
  6. Step 6: Final answer
    x = 985.38

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Double scale
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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.