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Finding the Fourth Proportional to 21,689.67, 29,932.47 and 12,258.84

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Solution

The fourth proportional to 21,689.67, 29,932.47 and 12,258.84 is: 16,917.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,689.67 : 29,932.47 = 12,258.84 : x
  2. Step 2: Convert to fraction form
    21,689.67/29,932.47 = 12,258.84/x
  3. Step 3: Cross multiply
    21,689.67x = 29,932.47 × 12,258.84
  4. Step 4: Simplify right side
    21,689.67x = 366,937,360.53
  5. Step 5: Solve for x
    x = 366,937,360.53/21,689.67
  6. Step 6: Final answer
    x = 16,917.61

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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.