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Finding the Fourth Proportional to 3,089.50, 4,634.25 and 781

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Solution

The fourth proportional to 3,089.50, 4,634.25 and 781 is: 1,171.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,089.50 : 4,634.25 = 781 : x
  2. Step 2: Convert to fraction form
    3,089.50/4,634.25 = 781/x
  3. Step 3: Cross multiply
    3,089.50x = 4,634.25 × 781
  4. Step 4: Simplify right side
    3,089.50x = 3,619,349.25
  5. Step 5: Solve for x
    x = 3,619,349.25/3,089.50
  6. Step 6: Final answer
    x = 1,171.50

Related Problems

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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.