Home / 1,478.24-2,039.97-815.07

Finding the Fourth Proportional to 1,478.24, 2,039.97 and 815.07

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Solution

The fourth proportional to 1,478.24, 2,039.97 and 815.07 is: 1,124.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,478.24 : 2,039.97 = 815.07 : x
  2. Step 2: Convert to fraction form
    1,478.24/2,039.97 = 815.07/x
  3. Step 3: Cross multiply
    1,478.24x = 2,039.97 × 815.07
  4. Step 4: Simplify right side
    1,478.24x = 1,662,729.05
  5. Step 5: Solve for x
    x = 1,662,729.05/1,478.24
  6. Step 6: Final answer
    x = 1,124.80

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.