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Finding the Fourth Proportional to 663,840.68, 915,942.67 and 377,338.21

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Solution

The fourth proportional to 663,840.68, 915,942.67 and 377,338.21 is: 520,637.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,840.68 : 915,942.67 = 377,338.21 : x
  2. Step 2: Convert to fraction form
    663,840.68/915,942.67 = 377,338.21/x
  3. Step 3: Cross multiply
    663,840.68x = 915,942.67 × 377,338.21
  4. Step 4: Simplify right side
    663,840.68x = 345,620,164,327.22
  5. Step 5: Solve for x
    x = 345,620,164,327.22/663,840.68
  6. Step 6: Final answer
    x = 520,637.22

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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.