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Finding the Fourth Proportional to 829.11, 1,143.59 and 703.90

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Solution

The fourth proportional to 829.11, 1,143.59 and 703.90 is: 970.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    829.11 : 1,143.59 = 703.90 : x
  2. Step 2: Convert to fraction form
    829.11/1,143.59 = 703.90/x
  3. Step 3: Cross multiply
    829.11x = 1,143.59 × 703.90
  4. Step 4: Simplify right side
    829.11x = 804,974.13
  5. Step 5: Solve for x
    x = 804,974.13/829.11
  6. Step 6: Final answer
    x = 970.89

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.