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Finding the Fourth Proportional to 21,659.76, 29,890.26 and 12,228.12

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Solution

The fourth proportional to 21,659.76, 29,890.26 and 12,228.12 is: 16,874.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,659.76 : 29,890.26 = 12,228.12 : x
  2. Step 2: Convert to fraction form
    21,659.76/29,890.26 = 12,228.12/x
  3. Step 3: Cross multiply
    21,659.76x = 29,890.26 × 12,228.12
  4. Step 4: Simplify right side
    21,659.76x = 365,501,686.11
  5. Step 5: Solve for x
    x = 365,501,686.11/21,659.76
  6. Step 6: Final answer
    x = 16,874.69

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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.