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Finding the Fourth Proportional to 76,690.80, 114,420.20 and 68,270.85

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Solution

The fourth proportional to 76,690.80, 114,420.20 and 68,270.85 is: 101,857.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,690.80 : 114,420.20 = 68,270.85 : x
  2. Step 2: Convert to fraction form
    76,690.80/114,420.20 = 68,270.85/x
  3. Step 3: Cross multiply
    76,690.80x = 114,420.20 × 68,270.85
  4. Step 4: Simplify right side
    76,690.80x = 7,811,563,969.82
  5. Step 5: Solve for x
    x = 7,811,563,969.82/76,690.80
  6. Step 6: Final answer
    x = 101,857.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.