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Finding the Fourth Proportional to 15,900.12, 21,940.76 and 8,728.88

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Solution

The fourth proportional to 15,900.12, 21,940.76 and 8,728.88 is: 12,045.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,900.12 : 21,940.76 = 8,728.88 : x
  2. Step 2: Convert to fraction form
    15,900.12/21,940.76 = 8,728.88/x
  3. Step 3: Cross multiply
    15,900.12x = 21,940.76 × 8,728.88
  4. Step 4: Simplify right side
    15,900.12x = 191,518,261.15
  5. Step 5: Solve for x
    x = 191,518,261.15/15,900.12
  6. Step 6: Final answer
    x = 12,045.08

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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.