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Finding the Fourth Proportional to 721.36, 1,081.83 and 259.05

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Solution

The fourth proportional to 721.36, 1,081.83 and 259.05 is: 388.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.36 : 1,081.83 = 259.05 : x
  2. Step 2: Convert to fraction form
    721.36/1,081.83 = 259.05/x
  3. Step 3: Cross multiply
    721.36x = 1,081.83 × 259.05
  4. Step 4: Simplify right side
    721.36x = 280,248.06
  5. Step 5: Solve for x
    x = 280,248.06/721.36
  6. Step 6: Final answer
    x = 388.50

Related Problems

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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 (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.