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Finding the Fourth Proportional to 667,959.50, 921,787.36 and 399,687.50

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Solution

The fourth proportional to 667,959.50, 921,787.36 and 399,687.50 is: 551,570.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    667,959.50 : 921,787.36 = 399,687.50 : x
  2. Step 2: Convert to fraction form
    667,959.50/921,787.36 = 399,687.50/x
  3. Step 3: Cross multiply
    667,959.50x = 921,787.36 × 399,687.50
  4. Step 4: Simplify right side
    667,959.50x = 368,426,885,450
  5. Step 5: Solve for x
    x = 368,426,885,450/667,959.50
  6. Step 6: Final answer
    x = 551,570.69

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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.