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Finding the Fourth Proportional to 794.98, 1,191.12 and 429.40

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Solution

The fourth proportional to 794.98, 1,191.12 and 429.40 is: 643.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    794.98 : 1,191.12 = 429.40 : x
  2. Step 2: Convert to fraction form
    794.98/1,191.12 = 429.40/x
  3. Step 3: Cross multiply
    794.98x = 1,191.12 × 429.40
  4. Step 4: Simplify right side
    794.98x = 511,466.93
  5. Step 5: Solve for x
    x = 511,466.93/794.98
  6. Step 6: Final answer
    x = 643.37

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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.