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Finding the Fourth Proportional to 1,285.99, 1,774.74 and 726.55

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Solution

The fourth proportional to 1,285.99, 1,774.74 and 726.55 is: 1,002.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285.99 : 1,774.74 = 726.55 : x
  2. Step 2: Convert to fraction form
    1,285.99/1,774.74 = 726.55/x
  3. Step 3: Cross multiply
    1,285.99x = 1,774.74 × 726.55
  4. Step 4: Simplify right side
    1,285.99x = 1,289,437.35
  5. Step 5: Solve for x
    x = 1,289,437.35/1,285.99
  6. Step 6: Final answer
    x = 1,002.68

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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.