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Finding the Fourth Proportional to 57,148.20, 85,722.30 and 20,212.20

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Solution

The fourth proportional to 57,148.20, 85,722.30 and 20,212.20 is: 30,318.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,148.20 : 85,722.30 = 20,212.20 : x
  2. Step 2: Convert to fraction form
    57,148.20/85,722.30 = 20,212.20/x
  3. Step 3: Cross multiply
    57,148.20x = 85,722.30 × 20,212.20
  4. Step 4: Simplify right side
    57,148.20x = 1,732,636,272.06
  5. Step 5: Solve for x
    x = 1,732,636,272.06/57,148.20
  6. Step 6: Final answer
    x = 30,318.30

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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.