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Finding the Fourth Proportional to 869.42, 1,199.76 and 476.43

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Solution

The fourth proportional to 869.42, 1,199.76 and 476.43 is: 657.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.42 : 1,199.76 = 476.43 : x
  2. Step 2: Convert to fraction form
    869.42/1,199.76 = 476.43/x
  3. Step 3: Cross multiply
    869.42x = 1,199.76 × 476.43
  4. Step 4: Simplify right side
    869.42x = 571,601.66
  5. Step 5: Solve for x
    x = 571,601.66/869.42
  6. Step 6: Final answer
    x = 657.45

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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.