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Finding the Fourth Proportional to 18,695.40, 28,020.90 and 9,925.80

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Solution

The fourth proportional to 18,695.40, 28,020.90 and 9,925.80 is: 14,876.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,695.40 : 28,020.90 = 9,925.80 : x
  2. Step 2: Convert to fraction form
    18,695.40/28,020.90 = 9,925.80/x
  3. Step 3: Cross multiply
    18,695.40x = 28,020.90 × 9,925.80
  4. Step 4: Simplify right side
    18,695.40x = 278,129,849.22
  5. Step 5: Solve for x
    x = 278,129,849.22/18,695.40
  6. Step 6: Final answer
    x = 14,876.91

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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.