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Finding the Fourth Proportional to 86,611.16, 129,890.77 and 30,440.80

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Solution

The fourth proportional to 86,611.16, 129,890.77 and 30,440.80 is: 45,652.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,611.16 : 129,890.77 = 30,440.80 : x
  2. Step 2: Convert to fraction form
    86,611.16/129,890.77 = 30,440.80/x
  3. Step 3: Cross multiply
    86,611.16x = 129,890.77 × 30,440.80
  4. Step 4: Simplify right side
    86,611.16x = 3,953,978,951.42
  5. Step 5: Solve for x
    x = 3,953,978,951.42/86,611.16
  6. Step 6: Final answer
    x = 45,652.07

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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.