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Finding the Fourth Proportional to 90,415.96, 135,580.20 and 31,230.88

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Solution

The fourth proportional to 90,415.96, 135,580.20 and 31,230.88 is: 46,831.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,415.96 : 135,580.20 = 31,230.88 : x
  2. Step 2: Convert to fraction form
    90,415.96/135,580.20 = 31,230.88/x
  3. Step 3: Cross multiply
    90,415.96x = 135,580.20 × 31,230.88
  4. Step 4: Simplify right side
    90,415.96x = 4,234,288,956.58
  5. Step 5: Solve for x
    x = 4,234,288,956.58/90,415.96
  6. Step 6: Final answer
    x = 46,831.21

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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.