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Finding the Fourth Proportional to 19,963.70, 29,920.35 and 10,105.70

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Solution

The fourth proportional to 19,963.70, 29,920.35 and 10,105.70 is: 15,145.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,963.70 : 29,920.35 = 10,105.70 : x
  2. Step 2: Convert to fraction form
    19,963.70/29,920.35 = 10,105.70/x
  3. Step 3: Cross multiply
    19,963.70x = 29,920.35 × 10,105.70
  4. Step 4: Simplify right side
    19,963.70x = 302,366,081.00
  5. Step 5: Solve for x
    x = 302,366,081.00/19,963.70
  6. Step 6: Final answer
    x = 15,145.79

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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.