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Finding the Fourth Proportional to 66,690.54, 91,942.90 and 42,775.70

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Solution

The fourth proportional to 66,690.54, 91,942.90 and 42,775.70 is: 58,972.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,690.54 : 91,942.90 = 42,775.70 : x
  2. Step 2: Convert to fraction form
    66,690.54/91,942.90 = 42,775.70/x
  3. Step 3: Cross multiply
    66,690.54x = 91,942.90 × 42,775.70
  4. Step 4: Simplify right side
    66,690.54x = 3,932,921,340.88
  5. Step 5: Solve for x
    x = 3,932,921,340.88/66,690.54
  6. Step 6: Final answer
    x = 58,972.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.