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Finding the Fourth Proportional to 667,619.76, 921,315.48 and 361,698.25

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Solution

The fourth proportional to 667,619.76, 921,315.48 and 361,698.25 is: 499,143.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    667,619.76 : 921,315.48 = 361,698.25 : x
  2. Step 2: Convert to fraction form
    667,619.76/921,315.48 = 361,698.25/x
  3. Step 3: Cross multiply
    667,619.76x = 921,315.48 × 361,698.25
  4. Step 4: Simplify right side
    667,619.76x = 333,238,196,813.91
  5. Step 5: Solve for x
    x = 333,238,196,813.91/667,619.76
  6. Step 6: Final answer
    x = 499,143.70

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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.