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Finding the Fourth Proportional to 143,491.20, 215,139.60 and 73,312.80

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Solution

The fourth proportional to 143,491.20, 215,139.60 and 73,312.80 is: 109,919.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,491.20 : 215,139.60 = 73,312.80 : x
  2. Step 2: Convert to fraction form
    143,491.20/215,139.60 = 73,312.80/x
  3. Step 3: Cross multiply
    143,491.20x = 215,139.60 × 73,312.80
  4. Step 4: Simplify right side
    143,491.20x = 15,772,486,466.88
  5. Step 5: Solve for x
    x = 15,772,486,466.88/143,491.20
  6. Step 6: Final answer
    x = 109,919.54

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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.