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Finding the Fourth Proportional to 80,643.60, 120,835.80 and 67,424.40

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Solution

The fourth proportional to 80,643.60, 120,835.80 and 67,424.40 is: 101,028.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,643.60 : 120,835.80 = 67,424.40 : x
  2. Step 2: Convert to fraction form
    80,643.60/120,835.80 = 67,424.40/x
  3. Step 3: Cross multiply
    80,643.60x = 120,835.80 × 67,424.40
  4. Step 4: Simplify right side
    80,643.60x = 8,147,281,313.52
  5. Step 5: Solve for x
    x = 8,147,281,313.52/80,643.60
  6. Step 6: Final answer
    x = 101,028.24

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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.