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Finding the Fourth Proportional to 1,208.42, 1,812.80 and 386.58

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Solution

The fourth proportional to 1,208.42, 1,812.80 and 386.58 is: 579.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,208.42 : 1,812.80 = 386.58 : x
  2. Step 2: Convert to fraction form
    1,208.42/1,812.80 = 386.58/x
  3. Step 3: Cross multiply
    1,208.42x = 1,812.80 × 386.58
  4. Step 4: Simplify right side
    1,208.42x = 700,799.99
  5. Step 5: Solve for x
    x = 700,799.99/1,208.42
  6. Step 6: Final answer
    x = 579.93

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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.