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Finding the Fourth Proportional to 140,578.72, 210,992.80 and 65,739.60

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Solution

The fourth proportional to 140,578.72, 210,992.80 and 65,739.60 is: 98,667.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    140,578.72 : 210,992.80 = 65,739.60 : x
  2. Step 2: Convert to fraction form
    140,578.72/210,992.80 = 65,739.60/x
  3. Step 3: Cross multiply
    140,578.72x = 210,992.80 × 65,739.60
  4. Step 4: Simplify right side
    140,578.72x = 13,870,582,274.88
  5. Step 5: Solve for x
    x = 13,870,582,274.88/140,578.72
  6. Step 6: Final answer
    x = 98,667.72

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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.