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Finding the Fourth Proportional to 21,761.52, 30,026.88 and 13,261.68

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Solution

The fourth proportional to 21,761.52, 30,026.88 and 13,261.68 is: 18,298.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,761.52 : 30,026.88 = 13,261.68 : x
  2. Step 2: Convert to fraction form
    21,761.52/30,026.88 = 13,261.68/x
  3. Step 3: Cross multiply
    21,761.52x = 30,026.88 × 13,261.68
  4. Step 4: Simplify right side
    21,761.52x = 398,206,873.96
  5. Step 5: Solve for x
    x = 398,206,873.96/21,761.52
  6. Step 6: Final answer
    x = 18,298.67

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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.