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Finding the Fourth Proportional to 30,820.80, 46,231.20 and 28,099.20

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Solution

The fourth proportional to 30,820.80, 46,231.20 and 28,099.20 is: 42,148.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,820.80 : 46,231.20 = 28,099.20 : x
  2. Step 2: Convert to fraction form
    30,820.80/46,231.20 = 28,099.20/x
  3. Step 3: Cross multiply
    30,820.80x = 46,231.20 × 28,099.20
  4. Step 4: Simplify right side
    30,820.80x = 1,299,059,735.04
  5. Step 5: Solve for x
    x = 1,299,059,735.04/30,820.80
  6. Step 6: Final answer
    x = 42,148.80

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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.