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Finding the Fourth Proportional to 3,772.80, 5,659.20 and 999.90

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Solution

The fourth proportional to 3,772.80, 5,659.20 and 999.90 is: 1,499.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,772.80 : 5,659.20 = 999.90 : x
  2. Step 2: Convert to fraction form
    3,772.80/5,659.20 = 999.90/x
  3. Step 3: Cross multiply
    3,772.80x = 5,659.20 × 999.90
  4. Step 4: Simplify right side
    3,772.80x = 5,658,634.08
  5. Step 5: Solve for x
    x = 5,658,634.08/3,772.80
  6. Step 6: Final answer
    x = 1,499.85

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.