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Finding the Fourth Proportional to 18,729.88, 28,095.90 and 7,043.20

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Solution

The fourth proportional to 18,729.88, 28,095.90 and 7,043.20 is: 10,565.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,729.88 : 28,095.90 = 7,043.20 : x
  2. Step 2: Convert to fraction form
    18,729.88/28,095.90 = 7,043.20/x
  3. Step 3: Cross multiply
    18,729.88x = 28,095.90 × 7,043.20
  4. Step 4: Simplify right side
    18,729.88x = 197,885,042.88
  5. Step 5: Solve for x
    x = 197,885,042.88/18,729.88
  6. Step 6: Final answer
    x = 10,565.21

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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.