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Finding the Fourth Proportional to 1,227.79, 1,693.66 and 778.85

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Solution

The fourth proportional to 1,227.79, 1,693.66 and 778.85 is: 1,074.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,227.79 : 1,693.66 = 778.85 : x
  2. Step 2: Convert to fraction form
    1,227.79/1,693.66 = 778.85/x
  3. Step 3: Cross multiply
    1,227.79x = 1,693.66 × 778.85
  4. Step 4: Simplify right side
    1,227.79x = 1,319,107.09
  5. Step 5: Solve for x
    x = 1,319,107.09/1,227.79
  6. Step 6: Final answer
    x = 1,074.38

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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.