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Finding the Fourth Proportional to 863.64, 1,192.32 and 686.36

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Solution

The fourth proportional to 863.64, 1,192.32 and 686.36 is: 947.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.64 : 1,192.32 = 686.36 : x
  2. Step 2: Convert to fraction form
    863.64/1,192.32 = 686.36/x
  3. Step 3: Cross multiply
    863.64x = 1,192.32 × 686.36
  4. Step 4: Simplify right side
    863.64x = 818,354.79
  5. Step 5: Solve for x
    x = 818,354.79/863.64
  6. Step 6: Final answer
    x = 947.56

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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.