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Finding the Fourth Proportional to 86,691, 130,074.06 and 30,571.20

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Solution

The fourth proportional to 86,691, 130,074.06 and 30,571.20 is: 45,870.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,691 : 130,074.06 = 30,571.20 : x
  2. Step 2: Convert to fraction form
    86,691/130,074.06 = 30,571.20/x
  3. Step 3: Cross multiply
    86,691x = 130,074.06 × 30,571.20
  4. Step 4: Simplify right side
    86,691x = 3,976,520,103.07
  5. Step 5: Solve for x
    x = 3,976,520,103.07/86,691
  6. Step 6: Final answer
    x = 45,870.05

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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.