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Finding the Fourth Proportional to 80,876.60, 121,314.90 and 51,206.30

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Solution

The fourth proportional to 80,876.60, 121,314.90 and 51,206.30 is: 76,809.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,876.60 : 121,314.90 = 51,206.30 : x
  2. Step 2: Convert to fraction form
    80,876.60/121,314.90 = 51,206.30/x
  3. Step 3: Cross multiply
    80,876.60x = 121,314.90 × 51,206.30
  4. Step 4: Simplify right side
    80,876.60x = 6,212,087,163.87
  5. Step 5: Solve for x
    x = 6,212,087,163.87/80,876.60
  6. Step 6: Final answer
    x = 76,809.45

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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.