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Finding the Fourth Proportional to 869.40, 1,199.76 and 496.38

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Solution

The fourth proportional to 869.40, 1,199.76 and 496.38 is: 685.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.40 : 1,199.76 = 496.38 : x
  2. Step 2: Convert to fraction form
    869.40/1,199.76 = 496.38/x
  3. Step 3: Cross multiply
    869.40x = 1,199.76 × 496.38
  4. Step 4: Simplify right side
    869.40x = 595,536.87
  5. Step 5: Solve for x
    x = 595,536.87/869.40
  6. Step 6: Final answer
    x = 685.00

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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.