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Finding the Fourth Proportional to 998.77, 1,378.31 and 579.37

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Solution

The fourth proportional to 998.77, 1,378.31 and 579.37 is: 799.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.77 : 1,378.31 = 579.37 : x
  2. Step 2: Convert to fraction form
    998.77/1,378.31 = 579.37/x
  3. Step 3: Cross multiply
    998.77x = 1,378.31 × 579.37
  4. Step 4: Simplify right side
    998.77x = 798,549.45
  5. Step 5: Solve for x
    x = 798,549.45/998.77
  6. Step 6: Final answer
    x = 799.53

Related Problems

Find fourth proportional to 499.38, 689.15 and 289.68
Half scale
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Double scale
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Similar ratio
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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.