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Finding the Fourth Proportional to 1,285.61, 1,781.60 and 1,260.99

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Solution

The fourth proportional to 1,285.61, 1,781.60 and 1,260.99 is: 1,747.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285.61 : 1,781.60 = 1,260.99 : x
  2. Step 2: Convert to fraction form
    1,285.61/1,781.60 = 1,260.99/x
  3. Step 3: Cross multiply
    1,285.61x = 1,781.60 × 1,260.99
  4. Step 4: Simplify right side
    1,285.61x = 2,246,573.48
  5. Step 5: Solve for x
    x = 2,246,573.48/1,285.61
  6. Step 6: Final answer
    x = 1,747.48

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.