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Finding the Fourth Proportional to 1,025.79, 1,538.07 and 409.59

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Solution

The fourth proportional to 1,025.79, 1,538.07 and 409.59 is: 614.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,025.79 : 1,538.07 = 409.59 : x
  2. Step 2: Convert to fraction form
    1,025.79/1,538.07 = 409.59/x
  3. Step 3: Cross multiply
    1,025.79x = 1,538.07 × 409.59
  4. Step 4: Simplify right side
    1,025.79x = 629,978.09
  5. Step 5: Solve for x
    x = 629,978.09/1,025.79
  6. Step 6: Final answer
    x = 614.14

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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.