Home / 21,655.76-29,881.32-12,221.60

Finding the Fourth Proportional to 21,655.76, 29,881.32 and 12,221.60

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Solution

The fourth proportional to 21,655.76, 29,881.32 and 12,221.60 is: 16,863.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,655.76 : 29,881.32 = 12,221.60 : x
  2. Step 2: Convert to fraction form
    21,655.76/29,881.32 = 12,221.60/x
  3. Step 3: Cross multiply
    21,655.76x = 29,881.32 × 12,221.60
  4. Step 4: Simplify right side
    21,655.76x = 365,197,540.51
  5. Step 5: Solve for x
    x = 365,197,540.51/21,655.76
  6. Step 6: Final answer
    x = 16,863.76

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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.