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Finding the Fourth Proportional to 427,919.55, 641,980.64 and 139,729.78

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Solution

The fourth proportional to 427,919.55, 641,980.64 and 139,729.78 is: 209,627.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,919.55 : 641,980.64 = 139,729.78 : x
  2. Step 2: Convert to fraction form
    427,919.55/641,980.64 = 139,729.78/x
  3. Step 3: Cross multiply
    427,919.55x = 641,980.64 × 139,729.78
  4. Step 4: Simplify right side
    427,919.55x = 89,703,813,591.46
  5. Step 5: Solve for x
    x = 89,703,813,591.46/427,919.55
  6. Step 6: Final answer
    x = 209,627.75

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1.5x scale

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.