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Finding the Fourth Proportional to 18,751.70, 28,139.70 and 10,854.20

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Solution

The fourth proportional to 18,751.70, 28,139.70 and 10,854.20 is: 16,288.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,751.70 : 28,139.70 = 10,854.20 : x
  2. Step 2: Convert to fraction form
    18,751.70/28,139.70 = 10,854.20/x
  3. Step 3: Cross multiply
    18,751.70x = 28,139.70 × 10,854.20
  4. Step 4: Simplify right side
    18,751.70x = 305,433,931.74
  5. Step 5: Solve for x
    x = 305,433,931.74/18,751.70
  6. Step 6: Final answer
    x = 16,288.33

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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.