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Finding the Fourth Proportional to 15,640.88, 21,569.88 and 12,238.40

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Solution

The fourth proportional to 15,640.88, 21,569.88 and 12,238.40 is: 16,877.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,640.88 : 21,569.88 = 12,238.40 : x
  2. Step 2: Convert to fraction form
    15,640.88/21,569.88 = 12,238.40/x
  3. Step 3: Cross multiply
    15,640.88x = 21,569.88 × 12,238.40
  4. Step 4: Simplify right side
    15,640.88x = 263,980,819.39
  5. Step 5: Solve for x
    x = 263,980,819.39/15,640.88
  6. Step 6: Final answer
    x = 16,877.62

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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.