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Finding the Fourth Proportional to 15,168.98, 20,930.65 and 8,453.13

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Solution

The fourth proportional to 15,168.98, 20,930.65 and 8,453.13 is: 11,663.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,168.98 : 20,930.65 = 8,453.13 : x
  2. Step 2: Convert to fraction form
    15,168.98/20,930.65 = 8,453.13/x
  3. Step 3: Cross multiply
    15,168.98x = 20,930.65 × 8,453.13
  4. Step 4: Simplify right side
    15,168.98x = 176,929,484.30
  5. Step 5: Solve for x
    x = 176,929,484.30/15,168.98
  6. Step 6: Final answer
    x = 11,663.91

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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.