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Finding the Fourth Proportional to 15,489, 21,374.02 and 8,415.24

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Solution

The fourth proportional to 15,489, 21,374.02 and 8,415.24 is: 11,612.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,489 : 21,374.02 = 8,415.24 : x
  2. Step 2: Convert to fraction form
    15,489/21,374.02 = 8,415.24/x
  3. Step 3: Cross multiply
    15,489x = 21,374.02 × 8,415.24
  4. Step 4: Simplify right side
    15,489x = 179,867,508.06
  5. Step 5: Solve for x
    x = 179,867,508.06/15,489
  6. Step 6: Final answer
    x = 11,612.60

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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.