Home / 1,245.78-1,868.36-380.08

Finding the Fourth Proportional to 1,245.78, 1,868.36 and 380.08

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Solution

The fourth proportional to 1,245.78, 1,868.36 and 380.08 is: 570.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.78 : 1,868.36 = 380.08 : x
  2. Step 2: Convert to fraction form
    1,245.78/1,868.36 = 380.08/x
  3. Step 3: Cross multiply
    1,245.78x = 1,868.36 × 380.08
  4. Step 4: Simplify right side
    1,245.78x = 710,126.27
  5. Step 5: Solve for x
    x = 710,126.27/1,245.78
  6. Step 6: Final answer
    x = 570.03

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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.