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Finding the Fourth Proportional to 228,688.56, 315,591.12 and 128,086.56

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Solution

The fourth proportional to 228,688.56, 315,591.12 and 128,086.56 is: 176,759.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    228,688.56 : 315,591.12 = 128,086.56 : x
  2. Step 2: Convert to fraction form
    228,688.56/315,591.12 = 128,086.56/x
  3. Step 3: Cross multiply
    228,688.56x = 315,591.12 × 128,086.56
  4. Step 4: Simplify right side
    228,688.56x = 40,422,980,927.35
  5. Step 5: Solve for x
    x = 40,422,980,927.35/228,688.56
  6. Step 6: Final answer
    x = 176,759.96

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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.