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Finding the Fourth Proportional to 128,143.31, 192,142.95 and 53,213.04

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Solution

The fourth proportional to 128,143.31, 192,142.95 and 53,213.04 is: 79,789.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,143.31 : 192,142.95 = 53,213.04 : x
  2. Step 2: Convert to fraction form
    128,143.31/192,142.95 = 53,213.04/x
  3. Step 3: Cross multiply
    128,143.31x = 192,142.95 × 53,213.04
  4. Step 4: Simplify right side
    128,143.31x = 10,224,510,484.07
  5. Step 5: Solve for x
    x = 10,224,510,484.07/128,143.31
  6. Step 6: Final answer
    x = 79,789.66

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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.