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Finding the Fourth Proportional to 667,619.64, 921,311.28 and 361,702.05

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Solution

The fourth proportional to 667,619.64, 921,311.28 and 361,702.05 is: 499,146.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    667,619.64 : 921,311.28 = 361,702.05 : x
  2. Step 2: Convert to fraction form
    667,619.64/921,311.28 = 361,702.05/x
  3. Step 3: Cross multiply
    667,619.64x = 921,311.28 × 361,702.05
  4. Step 4: Simplify right side
    667,619.64x = 333,240,178,664.12
  5. Step 5: Solve for x
    x = 333,240,178,664.12/667,619.64
  6. Step 6: Final answer
    x = 499,146.76

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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.