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Finding the Fourth Proportional to 21,653.96, 29,881.86 and 12,223.40

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Solution

The fourth proportional to 21,653.96, 29,881.86 and 12,223.40 is: 16,867.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,653.96 : 29,881.86 = 12,223.40 : x
  2. Step 2: Convert to fraction form
    21,653.96/29,881.86 = 12,223.40/x
  3. Step 3: Cross multiply
    21,653.96x = 29,881.86 × 12,223.40
  4. Step 4: Simplify right side
    21,653.96x = 365,257,927.52
  5. Step 5: Solve for x
    x = 365,257,927.52/21,653.96
  6. Step 6: Final answer
    x = 16,867.95

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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.