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Finding the Fourth Proportional to 15,494.71, 21,383.19 and 8,421.58

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Solution

The fourth proportional to 15,494.71, 21,383.19 and 8,421.58 is: 11,622.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,494.71 : 21,383.19 = 8,421.58 : x
  2. Step 2: Convert to fraction form
    15,494.71/21,383.19 = 8,421.58/x
  3. Step 3: Cross multiply
    15,494.71x = 21,383.19 × 8,421.58
  4. Step 4: Simplify right side
    15,494.71x = 180,080,245.24
  5. Step 5: Solve for x
    x = 180,080,245.24/15,494.71
  6. Step 6: Final answer
    x = 11,622.05

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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.