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Finding the Fourth Proportional to 128,045.80, 191,823.90 and 68,861.80

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Solution

The fourth proportional to 128,045.80, 191,823.90 and 68,861.80 is: 103,161.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,045.80 : 191,823.90 = 68,861.80 : x
  2. Step 2: Convert to fraction form
    128,045.80/191,823.90 = 68,861.80/x
  3. Step 3: Cross multiply
    128,045.80x = 191,823.90 × 68,861.80
  4. Step 4: Simplify right side
    128,045.80x = 13,209,339,037.02
  5. Step 5: Solve for x
    x = 13,209,339,037.02/128,045.80
  6. Step 6: Final answer
    x = 103,161.05

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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.