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Finding the Fourth Proportional to 76,390.80, 114,672.60 and 45,243.60

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Solution

The fourth proportional to 76,390.80, 114,672.60 and 45,243.60 is: 67,916.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,390.80 : 114,672.60 = 45,243.60 : x
  2. Step 2: Convert to fraction form
    76,390.80/114,672.60 = 45,243.60/x
  3. Step 3: Cross multiply
    76,390.80x = 114,672.60 × 45,243.60
  4. Step 4: Simplify right side
    76,390.80x = 5,188,201,245.36
  5. Step 5: Solve for x
    x = 5,188,201,245.36/76,390.80
  6. Step 6: Final answer
    x = 67,916.57

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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.