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Finding the Fourth Proportional to 863.42, 1,191.51 and 490.39

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Solution

The fourth proportional to 863.42, 1,191.51 and 490.39 is: 676.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.42 : 1,191.51 = 490.39 : x
  2. Step 2: Convert to fraction form
    863.42/1,191.51 = 490.39/x
  3. Step 3: Cross multiply
    863.42x = 1,191.51 × 490.39
  4. Step 4: Simplify right side
    863.42x = 584,307.92
  5. Step 5: Solve for x
    x = 584,307.92/863.42
  6. Step 6: Final answer
    x = 676.74

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Half scale
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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.