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Finding the Fourth Proportional to 791.07, 1,187.06 and 421.10

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Solution

The fourth proportional to 791.07, 1,187.06 and 421.10 is: 631.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.07 : 1,187.06 = 421.10 : x
  2. Step 2: Convert to fraction form
    791.07/1,187.06 = 421.10/x
  3. Step 3: Cross multiply
    791.07x = 1,187.06 × 421.10
  4. Step 4: Simplify right side
    791.07x = 499,867.38
  5. Step 5: Solve for x
    x = 499,867.38/791.07
  6. Step 6: Final answer
    x = 631.89

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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.