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Finding the Fourth Proportional to 144,958.70, 217,438.05 and 85,763.90

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Solution

The fourth proportional to 144,958.70, 217,438.05 and 85,763.90 is: 128,645.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    144,958.70 : 217,438.05 = 85,763.90 : x
  2. Step 2: Convert to fraction form
    144,958.70/217,438.05 = 85,763.90/x
  3. Step 3: Cross multiply
    144,958.70x = 217,438.05 × 85,763.90
  4. Step 4: Simplify right side
    144,958.70x = 18,648,335,176.40
  5. Step 5: Solve for x
    x = 18,648,335,176.40/144,958.70
  6. Step 6: Final answer
    x = 128,645.85

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1.5x scale

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.