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Finding the Fourth Proportional to 793.17, 1,187.28 and 427.05

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Solution

The fourth proportional to 793.17, 1,187.28 and 427.05 is: 639.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    793.17 : 1,187.28 = 427.05 : x
  2. Step 2: Convert to fraction form
    793.17/1,187.28 = 427.05/x
  3. Step 3: Cross multiply
    793.17x = 1,187.28 × 427.05
  4. Step 4: Simplify right side
    793.17x = 507,027.92
  5. Step 5: Solve for x
    x = 507,027.92/793.17
  6. Step 6: Final answer
    x = 639.24

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.