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Finding the Fourth Proportional to 86,690.90, 130,073.92 and 30,571.11

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Solution

The fourth proportional to 86,690.90, 130,073.92 and 30,571.11 is: 45,869.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,690.90 : 130,073.92 = 30,571.11 : x
  2. Step 2: Convert to fraction form
    86,690.90/130,073.92 = 30,571.11/x
  3. Step 3: Cross multiply
    86,690.90x = 130,073.92 × 30,571.11
  4. Step 4: Simplify right side
    86,690.90x = 3,976,504,040.02
  5. Step 5: Solve for x
    x = 3,976,504,040.02/86,690.90
  6. Step 6: Final answer
    x = 45,869.91

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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.