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Finding the Fourth Proportional to 15,810.78, 21,818.72 and 8,640.62

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Solution

The fourth proportional to 15,810.78, 21,818.72 and 8,640.62 is: 11,923.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,810.78 : 21,818.72 = 8,640.62 : x
  2. Step 2: Convert to fraction form
    15,810.78/21,818.72 = 8,640.62/x
  3. Step 3: Cross multiply
    15,810.78x = 21,818.72 × 8,640.62
  4. Step 4: Simplify right side
    15,810.78x = 188,527,116.11
  5. Step 5: Solve for x
    x = 188,527,116.11/15,810.78
  6. Step 6: Final answer
    x = 11,923.96

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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.