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Finding the Fourth Proportional to 791.66, 1,187.47 and 427.16

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Solution

The fourth proportional to 791.66, 1,187.47 and 427.16 is: 640.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.66 : 1,187.47 = 427.16 : x
  2. Step 2: Convert to fraction form
    791.66/1,187.47 = 427.16/x
  3. Step 3: Cross multiply
    791.66x = 1,187.47 × 427.16
  4. Step 4: Simplify right side
    791.66x = 507,231.61
  5. Step 5: Solve for x
    x = 507,231.61/791.66
  6. Step 6: Final answer
    x = 640.72

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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.