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Finding the Fourth Proportional to 128,213.70, 192,061.35 and 86,223.30

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Solution

The fourth proportional to 128,213.70, 192,061.35 and 86,223.30 is: 129,160.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,213.70 : 192,061.35 = 86,223.30 : x
  2. Step 2: Convert to fraction form
    128,213.70/192,061.35 = 86,223.30/x
  3. Step 3: Cross multiply
    128,213.70x = 192,061.35 × 86,223.30
  4. Step 4: Simplify right side
    128,213.70x = 16,560,163,399.46
  5. Step 5: Solve for x
    x = 16,560,163,399.46/128,213.70
  6. Step 6: Final answer
    x = 129,160.64

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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.