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Finding the Fourth Proportional to 1,025.78, 1,539.31 and 409.39

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Solution

The fourth proportional to 1,025.78, 1,539.31 and 409.39 is: 614.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,025.78 : 1,539.31 = 409.39 : x
  2. Step 2: Convert to fraction form
    1,025.78/1,539.31 = 409.39/x
  3. Step 3: Cross multiply
    1,025.78x = 1,539.31 × 409.39
  4. Step 4: Simplify right side
    1,025.78x = 630,177.10
  5. Step 5: Solve for x
    x = 630,177.10/1,025.78
  6. Step 6: Final answer
    x = 614.34

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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.