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Finding the Fourth Proportional to 863.61, 1,191.43 and 601.78

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Solution

The fourth proportional to 863.61, 1,191.43 and 601.78 is: 830.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.61 : 1,191.43 = 601.78 : x
  2. Step 2: Convert to fraction form
    863.61/1,191.43 = 601.78/x
  3. Step 3: Cross multiply
    863.61x = 1,191.43 × 601.78
  4. Step 4: Simplify right side
    863.61x = 716,975.75
  5. Step 5: Solve for x
    x = 716,975.75/863.61
  6. Step 6: Final answer
    x = 830.21

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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.