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Finding the Fourth Proportional to 19,641.80, 27,105.42 and 10,689.20

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Solution

The fourth proportional to 19,641.80, 27,105.42 and 10,689.20 is: 14,750.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,641.80 : 27,105.42 = 10,689.20 : x
  2. Step 2: Convert to fraction form
    19,641.80/27,105.42 = 10,689.20/x
  3. Step 3: Cross multiply
    19,641.80x = 27,105.42 × 10,689.20
  4. Step 4: Simplify right side
    19,641.80x = 289,735,255.46
  5. Step 5: Solve for x
    x = 289,735,255.46/19,641.80
  6. Step 6: Final answer
    x = 14,750.95

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.