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Finding the Fourth Proportional to 139,237.80, 208,856.70 and 80,255.40

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Solution

The fourth proportional to 139,237.80, 208,856.70 and 80,255.40 is: 120,383.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,237.80 : 208,856.70 = 80,255.40 : x
  2. Step 2: Convert to fraction form
    139,237.80/208,856.70 = 80,255.40/x
  3. Step 3: Cross multiply
    139,237.80x = 208,856.70 × 80,255.40
  4. Step 4: Simplify right side
    139,237.80x = 16,761,878,001.18
  5. Step 5: Solve for x
    x = 16,761,878,001.18/139,237.80
  6. Step 6: Final answer
    x = 120,383.10

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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.