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Finding the Fourth Proportional to 1,207.95, 1,811.42 and 386.00

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Solution

The fourth proportional to 1,207.95, 1,811.42 and 386.00 is: 578.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,207.95 : 1,811.42 = 386.00 : x
  2. Step 2: Convert to fraction form
    1,207.95/1,811.42 = 386.00/x
  3. Step 3: Cross multiply
    1,207.95x = 1,811.42 × 386.00
  4. Step 4: Simplify right side
    1,207.95x = 699,212.17
  5. Step 5: Solve for x
    x = 699,212.17/1,207.95
  6. Step 6: Final answer
    x = 578.84

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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.