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Finding the Fourth Proportional to 143,985.60, 215,913.60 and 55,209.60

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Solution

The fourth proportional to 143,985.60, 215,913.60 and 55,209.60 is: 82,789.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,985.60 : 215,913.60 = 55,209.60 : x
  2. Step 2: Convert to fraction form
    143,985.60/215,913.60 = 55,209.60/x
  3. Step 3: Cross multiply
    143,985.60x = 215,913.60 × 55,209.60
  4. Step 4: Simplify right side
    143,985.60x = 11,920,503,490.56
  5. Step 5: Solve for x
    x = 11,920,503,490.56/143,985.60
  6. Step 6: Final answer
    x = 82,789.55

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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.