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Finding the Fourth Proportional to 399,792.40, 551,331.83 and 261,765.36

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Solution

The fourth proportional to 399,792.40, 551,331.83 and 261,765.36 is: 360,986.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,792.40 : 551,331.83 = 261,765.36 : x
  2. Step 2: Convert to fraction form
    399,792.40/551,331.83 = 261,765.36/x
  3. Step 3: Cross multiply
    399,792.40x = 551,331.83 × 261,765.36
  4. Step 4: Simplify right side
    399,792.40x = 144,319,574,959.41
  5. Step 5: Solve for x
    x = 144,319,574,959.41/399,792.40
  6. Step 6: Final answer
    x = 360,986.29

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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.