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Finding the Fourth Proportional to 15,753.66, 21,738.60 and 8,678.40

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Solution

The fourth proportional to 15,753.66, 21,738.60 and 8,678.40 is: 11,975.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,753.66 : 21,738.60 = 8,678.40 : x
  2. Step 2: Convert to fraction form
    15,753.66/21,738.60 = 8,678.40/x
  3. Step 3: Cross multiply
    15,753.66x = 21,738.60 × 8,678.40
  4. Step 4: Simplify right side
    15,753.66x = 188,656,266.24
  5. Step 5: Solve for x
    x = 188,656,266.24/15,753.66
  6. Step 6: Final answer
    x = 11,975.39

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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.