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Finding the Fourth Proportional to 128,423.20, 192,631.20 and 58,302.40

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Solution

The fourth proportional to 128,423.20, 192,631.20 and 58,302.40 is: 87,451.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,423.20 : 192,631.20 = 58,302.40 : x
  2. Step 2: Convert to fraction form
    128,423.20/192,631.20 = 58,302.40/x
  3. Step 3: Cross multiply
    128,423.20x = 192,631.20 × 58,302.40
  4. Step 4: Simplify right side
    128,423.20x = 11,230,861,274.88
  5. Step 5: Solve for x
    x = 11,230,861,274.88/128,423.20
  6. Step 6: Final answer
    x = 87,451.97

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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.