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Finding the Fourth Proportional to 572,138.04, 789,810.30 and 391,143

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Solution

The fourth proportional to 572,138.04, 789,810.30 and 391,143 is: 539,954.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    572,138.04 : 789,810.30 = 391,143 : x
  2. Step 2: Convert to fraction form
    572,138.04/789,810.30 = 391,143/x
  3. Step 3: Cross multiply
    572,138.04x = 789,810.30 × 391,143
  4. Step 4: Simplify right side
    572,138.04x = 308,928,770,172.90
  5. Step 5: Solve for x
    x = 308,928,770,172.90/572,138.04
  6. Step 6: Final answer
    x = 539,954.96

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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.