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Finding the Fourth Proportional to 143,916.20, 215,874.30 and 91,428.20

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Solution

The fourth proportional to 143,916.20, 215,874.30 and 91,428.20 is: 137,142.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,916.20 : 215,874.30 = 91,428.20 : x
  2. Step 2: Convert to fraction form
    143,916.20/215,874.30 = 91,428.20/x
  3. Step 3: Cross multiply
    143,916.20x = 215,874.30 × 91,428.20
  4. Step 4: Simplify right side
    143,916.20x = 19,736,998,675.26
  5. Step 5: Solve for x
    x = 19,736,998,675.26/143,916.20
  6. Step 6: Final answer
    x = 137,142.30

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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.