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Finding the Fourth Proportional to 1,208.39, 1,812.55 and 342.71

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Solution

The fourth proportional to 1,208.39, 1,812.55 and 342.71 is: 514.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,208.39 : 1,812.55 = 342.71 : x
  2. Step 2: Convert to fraction form
    1,208.39/1,812.55 = 342.71/x
  3. Step 3: Cross multiply
    1,208.39x = 1,812.55 × 342.71
  4. Step 4: Simplify right side
    1,208.39x = 621,172.40
  5. Step 5: Solve for x
    x = 621,172.40/1,208.39
  6. Step 6: Final answer
    x = 514.05

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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.