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Finding the Fourth Proportional to 312,007.20, 468,086.40 and 90,391.20

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Solution

The fourth proportional to 312,007.20, 468,086.40 and 90,391.20 is: 135,608.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    312,007.20 : 468,086.40 = 90,391.20 : x
  2. Step 2: Convert to fraction form
    312,007.20/468,086.40 = 90,391.20/x
  3. Step 3: Cross multiply
    312,007.20x = 468,086.40 × 90,391.20
  4. Step 4: Simplify right side
    312,007.20x = 42,310,891,399.68
  5. Step 5: Solve for x
    x = 42,310,891,399.68/312,007.20
  6. Step 6: Final answer
    x = 135,608.70

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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.