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Finding the Fourth Proportional to 128,690.18, 193,061.09 and 44,453.42

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Solution

The fourth proportional to 128,690.18, 193,061.09 and 44,453.42 is: 66,689.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,690.18 : 193,061.09 = 44,453.42 : x
  2. Step 2: Convert to fraction form
    128,690.18/193,061.09 = 44,453.42/x
  3. Step 3: Cross multiply
    128,690.18x = 193,061.09 × 44,453.42
  4. Step 4: Simplify right side
    128,690.18x = 8,582,225,719.43
  5. Step 5: Solve for x
    x = 8,582,225,719.43/128,690.18
  6. Step 6: Final answer
    x = 66,689.05

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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.