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Finding the Fourth Proportional to 128,000.80, 191,756.40 and 68,816.80

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Solution

The fourth proportional to 128,000.80, 191,756.40 and 68,816.80 is: 103,093.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,000.80 : 191,756.40 = 68,816.80 : x
  2. Step 2: Convert to fraction form
    128,000.80/191,756.40 = 68,816.80/x
  3. Step 3: Cross multiply
    128,000.80x = 191,756.40 × 68,816.80
  4. Step 4: Simplify right side
    128,000.80x = 13,196,061,827.52
  5. Step 5: Solve for x
    x = 13,196,061,827.52/128,000.80
  6. Step 6: Final answer
    x = 103,093.59

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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.