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Finding the Fourth Proportional to 18,821.99, 28,234.51 and 9,457.17

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Solution

The fourth proportional to 18,821.99, 28,234.51 and 9,457.17 is: 14,186.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,821.99 : 28,234.51 = 9,457.17 : x
  2. Step 2: Convert to fraction form
    18,821.99/28,234.51 = 9,457.17/x
  3. Step 3: Cross multiply
    18,821.99x = 28,234.51 × 9,457.17
  4. Step 4: Simplify right side
    18,821.99x = 267,018,584.58
  5. Step 5: Solve for x
    x = 267,018,584.58/18,821.99
  6. Step 6: Final answer
    x = 14,186.53

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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.