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Finding the Fourth Proportional to 869.73, 1,305.50 and 458.75

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Solution

The fourth proportional to 869.73, 1,305.50 and 458.75 is: 688.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.73 : 1,305.50 = 458.75 : x
  2. Step 2: Convert to fraction form
    869.73/1,305.50 = 458.75/x
  3. Step 3: Cross multiply
    869.73x = 1,305.50 × 458.75
  4. Step 4: Simplify right side
    869.73x = 598,898.13
  5. Step 5: Solve for x
    x = 598,898.13/869.73
  6. Step 6: Final answer
    x = 688.60

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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.