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Finding the Fourth Proportional to 77,170.40, 115,690.80 and 40,234.40

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Solution

The fourth proportional to 77,170.40, 115,690.80 and 40,234.40 is: 60,317.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,170.40 : 115,690.80 = 40,234.40 : x
  2. Step 2: Convert to fraction form
    77,170.40/115,690.80 = 40,234.40/x
  3. Step 3: Cross multiply
    77,170.40x = 115,690.80 × 40,234.40
  4. Step 4: Simplify right side
    77,170.40x = 4,654,749,923.52
  5. Step 5: Solve for x
    x = 4,654,749,923.52/77,170.40
  6. Step 6: Final answer
    x = 60,317.82

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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.