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Finding the Fourth Proportional to 143,139.70, 214,709.55 and 90,781.30

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Solution

The fourth proportional to 143,139.70, 214,709.55 and 90,781.30 is: 136,171.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,139.70 : 214,709.55 = 90,781.30 : x
  2. Step 2: Convert to fraction form
    143,139.70/214,709.55 = 90,781.30/x
  3. Step 3: Cross multiply
    143,139.70x = 214,709.55 × 90,781.30
  4. Step 4: Simplify right side
    143,139.70x = 19,491,612,071.42
  5. Step 5: Solve for x
    x = 19,491,612,071.42/143,139.70
  6. Step 6: Final answer
    x = 136,171.95

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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.