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Finding the Fourth Proportional to 794.11, 1,191.66 and 429.15

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Solution

The fourth proportional to 794.11, 1,191.66 and 429.15 is: 643.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    794.11 : 1,191.66 = 429.15 : x
  2. Step 2: Convert to fraction form
    794.11/1,191.66 = 429.15/x
  3. Step 3: Cross multiply
    794.11x = 1,191.66 × 429.15
  4. Step 4: Simplify right side
    794.11x = 511,400.89
  5. Step 5: Solve for x
    x = 511,400.89/794.11
  6. Step 6: Final answer
    x = 643.99

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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.