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Finding the Fourth Proportional to 754.93, 1,131.79 and 389.53

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Solution

The fourth proportional to 754.93, 1,131.79 and 389.53 is: 583.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    754.93 : 1,131.79 = 389.53 : x
  2. Step 2: Convert to fraction form
    754.93/1,131.79 = 389.53/x
  3. Step 3: Cross multiply
    754.93x = 1,131.79 × 389.53
  4. Step 4: Simplify right side
    754.93x = 440,866.16
  5. Step 5: Solve for x
    x = 440,866.16/754.93
  6. Step 6: Final answer
    x = 583.98

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.