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Finding the Fourth Proportional to 863.40, 1,191.24 and 615.36

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Solution

The fourth proportional to 863.40, 1,191.24 and 615.36 is: 849.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.40 : 1,191.24 = 615.36 : x
  2. Step 2: Convert to fraction form
    863.40/1,191.24 = 615.36/x
  3. Step 3: Cross multiply
    863.40x = 1,191.24 × 615.36
  4. Step 4: Simplify right side
    863.40x = 733,041.45
  5. Step 5: Solve for x
    x = 733,041.45/863.40
  6. Step 6: Final answer
    x = 849.02

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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.