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Finding the Fourth Proportional to 998.19, 1,377.63 and 578.61

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Solution

The fourth proportional to 998.19, 1,377.63 and 578.61 is: 798.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.19 : 1,377.63 = 578.61 : x
  2. Step 2: Convert to fraction form
    998.19/1,377.63 = 578.61/x
  3. Step 3: Cross multiply
    998.19x = 1,377.63 × 578.61
  4. Step 4: Simplify right side
    998.19x = 797,110.49
  5. Step 5: Solve for x
    x = 797,110.49/998.19
  6. Step 6: Final answer
    x = 798.56

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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.