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Finding the Fourth Proportional to 143,913.20, 215,869.80 and 91,425.20

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Solution

The fourth proportional to 143,913.20, 215,869.80 and 91,425.20 is: 137,137.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,913.20 : 215,869.80 = 91,425.20 : x
  2. Step 2: Convert to fraction form
    143,913.20/215,869.80 = 91,425.20/x
  3. Step 3: Cross multiply
    143,913.20x = 215,869.80 × 91,425.20
  4. Step 4: Simplify right side
    143,913.20x = 19,735,939,638.96
  5. Step 5: Solve for x
    x = 19,735,939,638.96/143,913.20
  6. Step 6: Final answer
    x = 137,137.80

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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.