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Finding the Fourth Proportional to 1,227.69, 1,693.49 and 785.43

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Solution

The fourth proportional to 1,227.69, 1,693.49 and 785.43 is: 1,083.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,227.69 : 1,693.49 = 785.43 : x
  2. Step 2: Convert to fraction form
    1,227.69/1,693.49 = 785.43/x
  3. Step 3: Cross multiply
    1,227.69x = 1,693.49 × 785.43
  4. Step 4: Simplify right side
    1,227.69x = 1,330,113.92
  5. Step 5: Solve for x
    x = 1,330,113.92/1,227.69
  6. Step 6: Final answer
    x = 1,083.43

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Half scale
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Double scale
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1.5x scale

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.