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Finding the Fourth Proportional to 80,428.88, 120,643.32 and 43,564.88

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Solution

The fourth proportional to 80,428.88, 120,643.32 and 43,564.88 is: 65,347.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,428.88 : 120,643.32 = 43,564.88 : x
  2. Step 2: Convert to fraction form
    80,428.88/120,643.32 = 43,564.88/x
  3. Step 3: Cross multiply
    80,428.88x = 120,643.32 × 43,564.88
  4. Step 4: Simplify right side
    80,428.88x = 5,255,811,758.60
  5. Step 5: Solve for x
    x = 5,255,811,758.60/80,428.88
  6. Step 6: Final answer
    x = 65,347.32

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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.