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Finding the Fourth Proportional to 22,390.65, 30,899.09 and 12,318.88

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Solution

The fourth proportional to 22,390.65, 30,899.09 and 12,318.88 is: 17,000.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    22,390.65 : 30,899.09 = 12,318.88 : x
  2. Step 2: Convert to fraction form
    22,390.65/30,899.09 = 12,318.88/x
  3. Step 3: Cross multiply
    22,390.65x = 30,899.09 × 12,318.88
  4. Step 4: Simplify right side
    22,390.65x = 380,642,181.82
  5. Step 5: Solve for x
    x = 380,642,181.82/22,390.65
  6. Step 6: Final answer
    x = 17,000.05

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.