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Finding the Fourth Proportional to 131,390.80, 197,134.80 and 42,647.20

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Solution

The fourth proportional to 131,390.80, 197,134.80 and 42,647.20 is: 63,986.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,390.80 : 197,134.80 = 42,647.20 : x
  2. Step 2: Convert to fraction form
    131,390.80/197,134.80 = 42,647.20/x
  3. Step 3: Cross multiply
    131,390.80x = 197,134.80 × 42,647.20
  4. Step 4: Simplify right side
    131,390.80x = 8,407,247,242.56
  5. Step 5: Solve for x
    x = 8,407,247,242.56/131,390.80
  6. Step 6: Final answer
    x = 63,986.57

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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.