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Finding the Fourth Proportional to 3,239.70, 4,859.55 and 899.70

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Solution

The fourth proportional to 3,239.70, 4,859.55 and 899.70 is: 1,349.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,239.70 : 4,859.55 = 899.70 : x
  2. Step 2: Convert to fraction form
    3,239.70/4,859.55 = 899.70/x
  3. Step 3: Cross multiply
    3,239.70x = 4,859.55 × 899.70
  4. Step 4: Simplify right side
    3,239.70x = 4,372,137.14
  5. Step 5: Solve for x
    x = 4,372,137.14/3,239.70
  6. Step 6: Final answer
    x = 1,349.55

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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.