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Finding the Fourth Proportional to 426,395.31, 638,893.08 and 145,759.47

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Solution

The fourth proportional to 426,395.31, 638,893.08 and 145,759.47 is: 218,399.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,395.31 : 638,893.08 = 145,759.47 : x
  2. Step 2: Convert to fraction form
    426,395.31/638,893.08 = 145,759.47/x
  3. Step 3: Cross multiply
    426,395.31x = 638,893.08 × 145,759.47
  4. Step 4: Simplify right side
    426,395.31x = 93,124,716,727.47
  5. Step 5: Solve for x
    x = 93,124,716,727.47/426,395.31
  6. Step 6: Final answer
    x = 218,399.96

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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.