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Finding the Fourth Proportional to 15,878.64, 21,912.88 and 8,708.72

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Solution

The fourth proportional to 15,878.64, 21,912.88 and 8,708.72 is: 12,018.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,878.64 : 21,912.88 = 8,708.72 : x
  2. Step 2: Convert to fraction form
    15,878.64/21,912.88 = 8,708.72/x
  3. Step 3: Cross multiply
    15,878.64x = 21,912.88 × 8,708.72
  4. Step 4: Simplify right side
    15,878.64x = 190,833,136.31
  5. Step 5: Solve for x
    x = 190,833,136.31/15,878.64
  6. Step 6: Final answer
    x = 12,018.23

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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.