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Finding the Fourth Proportional to 628,661.84, 867,572.12 and 387,083.80

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Solution

The fourth proportional to 628,661.84, 867,572.12 and 387,083.80 is: 534,187.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    628,661.84 : 867,572.12 = 387,083.80 : x
  2. Step 2: Convert to fraction form
    628,661.84/867,572.12 = 387,083.80/x
  3. Step 3: Cross multiply
    628,661.84x = 867,572.12 × 387,083.80
  4. Step 4: Simplify right side
    628,661.84x = 335,823,112,983.66
  5. Step 5: Solve for x
    x = 335,823,112,983.66/628,661.84
  6. Step 6: Final answer
    x = 534,187.21

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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.