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Finding the Fourth Proportional to 136,679.20, 205,051.20 and 70,129.60

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Solution

The fourth proportional to 136,679.20, 205,051.20 and 70,129.60 is: 105,211.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,679.20 : 205,051.20 = 70,129.60 : x
  2. Step 2: Convert to fraction form
    136,679.20/205,051.20 = 70,129.60/x
  3. Step 3: Cross multiply
    136,679.20x = 205,051.20 × 70,129.60
  4. Step 4: Simplify right side
    136,679.20x = 14,380,158,635.52
  5. Step 5: Solve for x
    x = 14,380,158,635.52/136,679.20
  6. Step 6: Final answer
    x = 105,211.02

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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.