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Finding the Fourth Proportional to 15,696.63, 21,660.54 and 8,621.70

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Solution

The fourth proportional to 15,696.63, 21,660.54 and 8,621.70 is: 11,897.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,696.63 : 21,660.54 = 8,621.70 : x
  2. Step 2: Convert to fraction form
    15,696.63/21,660.54 = 8,621.70/x
  3. Step 3: Cross multiply
    15,696.63x = 21,660.54 × 8,621.70
  4. Step 4: Simplify right side
    15,696.63x = 186,750,677.72
  5. Step 5: Solve for x
    x = 186,750,677.72/15,696.63
  6. Step 6: Final answer
    x = 11,897.50

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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.