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Finding the Fourth Proportional to 869.70, 1,304.49 and 407.58

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Solution

The fourth proportional to 869.70, 1,304.49 and 407.58 is: 611.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.70 : 1,304.49 = 407.58 : x
  2. Step 2: Convert to fraction form
    869.70/1,304.49 = 407.58/x
  3. Step 3: Cross multiply
    869.70x = 1,304.49 × 407.58
  4. Step 4: Simplify right side
    869.70x = 531,677.61
  5. Step 5: Solve for x
    x = 531,677.61/869.70
  6. Step 6: Final answer
    x = 611.34

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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.