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Finding the Fourth Proportional to 1,072.40, 1,608.71 and 342

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Solution

The fourth proportional to 1,072.40, 1,608.71 and 342 is: 513.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,072.40 : 1,608.71 = 342 : x
  2. Step 2: Convert to fraction form
    1,072.40/1,608.71 = 342/x
  3. Step 3: Cross multiply
    1,072.40x = 1,608.71 × 342
  4. Step 4: Simplify right side
    1,072.40x = 550,177.11
  5. Step 5: Solve for x
    x = 550,177.11/1,072.40
  6. Step 6: Final answer
    x = 513.04

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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.