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Finding the Fourth Proportional to 128,423.30, 192,853.65 and 91,244.30

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Solution

The fourth proportional to 128,423.30, 192,853.65 and 91,244.30 is: 137,021.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,423.30 : 192,853.65 = 91,244.30 : x
  2. Step 2: Convert to fraction form
    128,423.30/192,853.65 = 91,244.30/x
  3. Step 3: Cross multiply
    128,423.30x = 192,853.65 × 91,244.30
  4. Step 4: Simplify right side
    128,423.30x = 17,596,796,296.70
  5. Step 5: Solve for x
    x = 17,596,796,296.70/128,423.30
  6. Step 6: Final answer
    x = 137,021.84

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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.