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Finding the Fourth Proportional to 20,485.71, 30,703.65 and 11,103.48

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Solution

The fourth proportional to 20,485.71, 30,703.65 and 11,103.48 is: 16,641.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,485.71 : 30,703.65 = 11,103.48 : x
  2. Step 2: Convert to fraction form
    20,485.71/30,703.65 = 11,103.48/x
  3. Step 3: Cross multiply
    20,485.71x = 30,703.65 × 11,103.48
  4. Step 4: Simplify right side
    20,485.71x = 340,917,363.70
  5. Step 5: Solve for x
    x = 340,917,363.70/20,485.71
  6. Step 6: Final answer
    x = 16,641.72

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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.