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Finding the Fourth Proportional to 15,818.76, 21,829.14 and 8,649.05

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Solution

The fourth proportional to 15,818.76, 21,829.14 and 8,649.05 is: 11,935.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,818.76 : 21,829.14 = 8,649.05 : x
  2. Step 2: Convert to fraction form
    15,818.76/21,829.14 = 8,649.05/x
  3. Step 3: Cross multiply
    15,818.76x = 21,829.14 × 8,649.05
  4. Step 4: Simplify right side
    15,818.76x = 188,801,214.17
  5. Step 5: Solve for x
    x = 188,801,214.17/15,818.76
  6. Step 6: Final answer
    x = 11,935.27

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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.