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Finding the Fourth Proportional to 45,999.90, 68,999.70 and 12,719.88

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Solution

The fourth proportional to 45,999.90, 68,999.70 and 12,719.88 is: 19,079.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    45,999.90 : 68,999.70 = 12,719.88 : x
  2. Step 2: Convert to fraction form
    45,999.90/68,999.70 = 12,719.88/x
  3. Step 3: Cross multiply
    45,999.90x = 68,999.70 × 12,719.88
  4. Step 4: Simplify right side
    45,999.90x = 877,667,904.04
  5. Step 5: Solve for x
    x = 877,667,904.04/45,999.90
  6. Step 6: Final answer
    x = 19,079.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.