Home / 15,489.09-21,374.91-8,415.54

Finding the Fourth Proportional to 15,489.09, 21,374.91 and 8,415.54

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Solution

The fourth proportional to 15,489.09, 21,374.91 and 8,415.54 is: 11,613.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,489.09 : 21,374.91 = 8,415.54 : x
  2. Step 2: Convert to fraction form
    15,489.09/21,374.91 = 8,415.54/x
  3. Step 3: Cross multiply
    15,489.09x = 21,374.91 × 8,415.54
  4. Step 4: Simplify right side
    15,489.09x = 179,881,410.10
  5. Step 5: Solve for x
    x = 179,881,410.10/15,489.09
  6. Step 6: Final answer
    x = 11,613.43

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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.