Home / 1,208.40-1,811.79-477.78

Finding the Fourth Proportional to 1,208.40, 1,811.79 and 477.78

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Solution

The fourth proportional to 1,208.40, 1,811.79 and 477.78 is: 716.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,208.40 : 1,811.79 = 477.78 : x
  2. Step 2: Convert to fraction form
    1,208.40/1,811.79 = 477.78/x
  3. Step 3: Cross multiply
    1,208.40x = 1,811.79 × 477.78
  4. Step 4: Simplify right side
    1,208.40x = 865,637.03
  5. Step 5: Solve for x
    x = 865,637.03/1,208.40
  6. Step 6: Final answer
    x = 716.35

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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.