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Finding the Fourth Proportional to 15,109.99, 20,855.10 and 8,397.91

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Solution

The fourth proportional to 15,109.99, 20,855.10 and 8,397.91 is: 11,590.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,109.99 : 20,855.10 = 8,397.91 : x
  2. Step 2: Convert to fraction form
    15,109.99/20,855.10 = 8,397.91/x
  3. Step 3: Cross multiply
    15,109.99x = 20,855.10 × 8,397.91
  4. Step 4: Simplify right side
    15,109.99x = 175,139,252.84
  5. Step 5: Solve for x
    x = 175,139,252.84/15,109.99
  6. Step 6: Final answer
    x = 11,590.96

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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.