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Finding the Fourth Proportional to 666,581.67, 919,620.95 and 387,131.29

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Solution

The fourth proportional to 666,581.67, 919,620.95 and 387,131.29 is: 534,089.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    666,581.67 : 919,620.95 = 387,131.29 : x
  2. Step 2: Convert to fraction form
    666,581.67/919,620.95 = 387,131.29/x
  3. Step 3: Cross multiply
    666,581.67x = 919,620.95 × 387,131.29
  4. Step 4: Simplify right side
    666,581.67x = 356,014,042,354.88
  5. Step 5: Solve for x
    x = 356,014,042,354.88/666,581.67
  6. Step 6: Final answer
    x = 534,089.16

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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.