Home / 2,505.78-3,458.03-1,386.80

Finding the Fourth Proportional to 2,505.78, 3,458.03 and 1,386.80

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Solution

The fourth proportional to 2,505.78, 3,458.03 and 1,386.80 is: 1,913.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,505.78 : 3,458.03 = 1,386.80 : x
  2. Step 2: Convert to fraction form
    2,505.78/3,458.03 = 1,386.80/x
  3. Step 3: Cross multiply
    2,505.78x = 3,458.03 × 1,386.80
  4. Step 4: Simplify right side
    2,505.78x = 4,795,596.00
  5. Step 5: Solve for x
    x = 4,795,596.00/2,505.78
  6. Step 6: Final answer
    x = 1,913.81

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1.5x scale

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.