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Finding the Fourth Proportional to 76,440.60, 114,660.90 and 20,280.60

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Solution

The fourth proportional to 76,440.60, 114,660.90 and 20,280.60 is: 30,420.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,440.60 : 114,660.90 = 20,280.60 : x
  2. Step 2: Convert to fraction form
    76,440.60/114,660.90 = 20,280.60/x
  3. Step 3: Cross multiply
    76,440.60x = 114,660.90 × 20,280.60
  4. Step 4: Simplify right side
    76,440.60x = 2,325,391,848.54
  5. Step 5: Solve for x
    x = 2,325,391,848.54/76,440.60
  6. Step 6: Final answer
    x = 30,420.90

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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.