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Finding the Fourth Proportional to 140,685, 211,027.50 and 42,189

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Solution

The fourth proportional to 140,685, 211,027.50 and 42,189 is: 63,283.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    140,685 : 211,027.50 = 42,189 : x
  2. Step 2: Convert to fraction form
    140,685/211,027.50 = 42,189/x
  3. Step 3: Cross multiply
    140,685x = 211,027.50 × 42,189
  4. Step 4: Simplify right side
    140,685x = 8,903,039,197.50
  5. Step 5: Solve for x
    x = 8,903,039,197.50/140,685
  6. Step 6: Final answer
    x = 63,283.50

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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.