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Finding the Fourth Proportional to 15,819.60, 21,830.36 and 8,649.33

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Solution

The fourth proportional to 15,819.60, 21,830.36 and 8,649.33 is: 11,935.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,819.60 : 21,830.36 = 8,649.33 : x
  2. Step 2: Convert to fraction form
    15,819.60/21,830.36 = 8,649.33/x
  3. Step 3: Cross multiply
    15,819.60x = 21,830.36 × 8,649.33
  4. Step 4: Simplify right side
    15,819.60x = 188,818,034.00
  5. Step 5: Solve for x
    x = 188,818,034.00/15,819.60
  6. Step 6: Final answer
    x = 11,935.70

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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.