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Finding the Fourth Proportional to 423,653.31, 635,449.20 and 139,340.58

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Solution

The fourth proportional to 423,653.31, 635,449.20 and 139,340.58 is: 209,000.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    423,653.31 : 635,449.20 = 139,340.58 : x
  2. Step 2: Convert to fraction form
    423,653.31/635,449.20 = 139,340.58/x
  3. Step 3: Cross multiply
    423,653.31x = 635,449.20 × 139,340.58
  4. Step 4: Simplify right side
    423,653.31x = 88,543,859,754.07
  5. Step 5: Solve for x
    x = 88,543,859,754.07/423,653.31
  6. Step 6: Final answer
    x = 209,000.75

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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.