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Finding the Fourth Proportional to 1,207.71, 1,811.61 and 386.55

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Solution

The fourth proportional to 1,207.71, 1,811.61 and 386.55 is: 579.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,207.71 : 1,811.61 = 386.55 : x
  2. Step 2: Convert to fraction form
    1,207.71/1,811.61 = 386.55/x
  3. Step 3: Cross multiply
    1,207.71x = 1,811.61 × 386.55
  4. Step 4: Simplify right side
    1,207.71x = 700,277.85
  5. Step 5: Solve for x
    x = 700,277.85/1,207.71
  6. Step 6: Final answer
    x = 579.84

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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.