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Finding the Fourth Proportional to 439,890, 607,048.20 and 238,686

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Solution

The fourth proportional to 439,890, 607,048.20 and 238,686 is: 329,386.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    439,890 : 607,048.20 = 238,686 : x
  2. Step 2: Convert to fraction form
    439,890/607,048.20 = 238,686/x
  3. Step 3: Cross multiply
    439,890x = 607,048.20 × 238,686
  4. Step 4: Simplify right side
    439,890x = 144,893,906,665.20
  5. Step 5: Solve for x
    x = 144,893,906,665.20/439,890
  6. Step 6: Final answer
    x = 329,386.68

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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.