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Finding the Fourth Proportional to 1,078.31, 1,617.31 and 347.79

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Solution

The fourth proportional to 1,078.31, 1,617.31 and 347.79 is: 521.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,078.31 : 1,617.31 = 347.79 : x
  2. Step 2: Convert to fraction form
    1,078.31/1,617.31 = 347.79/x
  3. Step 3: Cross multiply
    1,078.31x = 1,617.31 × 347.79
  4. Step 4: Simplify right side
    1,078.31x = 562,483.38
  5. Step 5: Solve for x
    x = 562,483.38/1,078.31
  6. Step 6: Final answer
    x = 521.63

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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.