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Finding the Fourth Proportional to 143,763.80, 215,904.90 and 139,098.20

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Solution

The fourth proportional to 143,763.80, 215,904.90 and 139,098.20 is: 208,898.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,763.80 : 215,904.90 = 139,098.20 : x
  2. Step 2: Convert to fraction form
    143,763.80/215,904.90 = 139,098.20/x
  3. Step 3: Cross multiply
    143,763.80x = 215,904.90 × 139,098.20
  4. Step 4: Simplify right side
    143,763.80x = 30,031,982,961.18
  5. Step 5: Solve for x
    x = 30,031,982,961.18/143,763.80
  6. Step 6: Final answer
    x = 208,898.09

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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.