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Finding the Fourth Proportional to 998.58, 1,378.25 and 699.69

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Solution

The fourth proportional to 998.58, 1,378.25 and 699.69 is: 965.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.58 : 1,378.25 = 699.69 : x
  2. Step 2: Convert to fraction form
    998.58/1,378.25 = 699.69/x
  3. Step 3: Cross multiply
    998.58x = 1,378.25 × 699.69
  4. Step 4: Simplify right side
    998.58x = 964,347.74
  5. Step 5: Solve for x
    x = 964,347.74/998.58
  6. Step 6: Final answer
    x = 965.72

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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.