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Finding the Fourth Proportional to 128,412.18, 192,491.91 and 75,036.42

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Solution

The fourth proportional to 128,412.18, 192,491.91 and 75,036.42 is: 112,480.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,412.18 : 192,491.91 = 75,036.42 : x
  2. Step 2: Convert to fraction form
    128,412.18/192,491.91 = 75,036.42/x
  3. Step 3: Cross multiply
    128,412.18x = 192,491.91 × 75,036.42
  4. Step 4: Simplify right side
    128,412.18x = 14,443,903,805.36
  5. Step 5: Solve for x
    x = 14,443,903,805.36/128,412.18
  6. Step 6: Final answer
    x = 112,480.79

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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.