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Finding the Fourth Proportional to 19,872.64, 27,419.52 and 11,915.52

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Solution

The fourth proportional to 19,872.64, 27,419.52 and 11,915.52 is: 16,440.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,872.64 : 27,419.52 = 11,915.52 : x
  2. Step 2: Convert to fraction form
    19,872.64/27,419.52 = 11,915.52/x
  3. Step 3: Cross multiply
    19,872.64x = 27,419.52 × 11,915.52
  4. Step 4: Simplify right side
    19,872.64x = 326,717,838.95
  5. Step 5: Solve for x
    x = 326,717,838.95/19,872.64
  6. Step 6: Final answer
    x = 16,440.59

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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.