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Finding the Fourth Proportional to 1,285.85, 1,774.62 and 726.42

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Solution

The fourth proportional to 1,285.85, 1,774.62 and 726.42 is: 1,002.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285.85 : 1,774.62 = 726.42 : x
  2. Step 2: Convert to fraction form
    1,285.85/1,774.62 = 726.42/x
  3. Step 3: Cross multiply
    1,285.85x = 1,774.62 × 726.42
  4. Step 4: Simplify right side
    1,285.85x = 1,289,119.46
  5. Step 5: Solve for x
    x = 1,289,119.46/1,285.85
  6. Step 6: Final answer
    x = 1,002.55

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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.