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Finding the Fourth Proportional to 86,571.80, 129,906.30 and 36,643.40

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Solution

The fourth proportional to 86,571.80, 129,906.30 and 36,643.40 is: 54,985.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,571.80 : 129,906.30 = 36,643.40 : x
  2. Step 2: Convert to fraction form
    86,571.80/129,906.30 = 36,643.40/x
  3. Step 3: Cross multiply
    86,571.80x = 129,906.30 × 36,643.40
  4. Step 4: Simplify right side
    86,571.80x = 4,760,208,513.42
  5. Step 5: Solve for x
    x = 4,760,208,513.42/86,571.80
  6. Step 6: Final answer
    x = 54,985.67

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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.