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Finding the Fourth Proportional to 15,680.64, 21,639.84 and 8,607.60

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Solution

The fourth proportional to 15,680.64, 21,639.84 and 8,607.60 is: 11,878.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,680.64 : 21,639.84 = 8,607.60 : x
  2. Step 2: Convert to fraction form
    15,680.64/21,639.84 = 8,607.60/x
  3. Step 3: Cross multiply
    15,680.64x = 21,639.84 × 8,607.60
  4. Step 4: Simplify right side
    15,680.64x = 186,267,086.78
  5. Step 5: Solve for x
    x = 186,267,086.78/15,680.64
  6. Step 6: Final answer
    x = 11,878.79

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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.