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Finding the Fourth Proportional to 667,960.50, 921,788.73 and 399,688.50

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Solution

The fourth proportional to 667,960.50, 921,788.73 and 399,688.50 is: 551,572.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    667,960.50 : 921,788.73 = 399,688.50 : x
  2. Step 2: Convert to fraction form
    667,960.50/921,788.73 = 399,688.50/x
  3. Step 3: Cross multiply
    667,960.50x = 921,788.73 × 399,688.50
  4. Step 4: Simplify right side
    667,960.50x = 368,428,354,810.61
  5. Step 5: Solve for x
    x = 368,428,354,810.61/667,960.50
  6. Step 6: Final answer
    x = 551,572.07

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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.