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Finding the Fourth Proportional to 21,775.78, 30,050.04 and 12,702.88

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Solution

The fourth proportional to 21,775.78, 30,050.04 and 12,702.88 is: 17,529.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,775.78 : 30,050.04 = 12,702.88 : x
  2. Step 2: Convert to fraction form
    21,775.78/30,050.04 = 12,702.88/x
  3. Step 3: Cross multiply
    21,775.78x = 30,050.04 × 12,702.88
  4. Step 4: Simplify right side
    21,775.78x = 381,722,052.12
  5. Step 5: Solve for x
    x = 381,722,052.12/21,775.78
  6. Step 6: Final answer
    x = 17,529.66

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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.