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Finding the Fourth Proportional to 128,074.80, 191,867.40 and 68,890.80

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Solution

The fourth proportional to 128,074.80, 191,867.40 and 68,890.80 is: 103,204.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,074.80 : 191,867.40 = 68,890.80 : x
  2. Step 2: Convert to fraction form
    128,074.80/191,867.40 = 68,890.80/x
  3. Step 3: Cross multiply
    128,074.80x = 191,867.40 × 68,890.80
  4. Step 4: Simplify right side
    128,074.80x = 13,217,898,679.92
  5. Step 5: Solve for x
    x = 13,217,898,679.92/128,074.80
  6. Step 6: Final answer
    x = 103,204.52

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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.