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Finding the Fourth Proportional to 15,143.76, 20,899.44 and 9,175.68

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Solution

The fourth proportional to 15,143.76, 20,899.44 and 9,175.68 is: 12,663.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,143.76 : 20,899.44 = 9,175.68 : x
  2. Step 2: Convert to fraction form
    15,143.76/20,899.44 = 9,175.68/x
  3. Step 3: Cross multiply
    15,143.76x = 20,899.44 × 9,175.68
  4. Step 4: Simplify right side
    15,143.76x = 191,766,573.62
  5. Step 5: Solve for x
    x = 191,766,573.62/15,143.76
  6. Step 6: Final answer
    x = 12,663.08

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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.