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Finding the Fourth Proportional to 312,904.20, 469,356.30 and 91,288.20

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Solution

The fourth proportional to 312,904.20, 469,356.30 and 91,288.20 is: 136,932.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    312,904.20 : 469,356.30 = 91,288.20 : x
  2. Step 2: Convert to fraction form
    312,904.20/469,356.30 = 91,288.20/x
  3. Step 3: Cross multiply
    312,904.20x = 469,356.30 × 91,288.20
  4. Step 4: Simplify right side
    312,904.20x = 42,846,691,785.66
  5. Step 5: Solve for x
    x = 42,846,691,785.66/312,904.20
  6. Step 6: Final answer
    x = 136,932.30

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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.