Home / 1,213.36-1,675.28-788.80

Finding the Fourth Proportional to 1,213.36, 1,675.28 and 788.80

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Solution

The fourth proportional to 1,213.36, 1,675.28 and 788.80 is: 1,089.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,213.36 : 1,675.28 = 788.80 : x
  2. Step 2: Convert to fraction form
    1,213.36/1,675.28 = 788.80/x
  3. Step 3: Cross multiply
    1,213.36x = 1,675.28 × 788.80
  4. Step 4: Simplify right side
    1,213.36x = 1,321,460.86
  5. Step 5: Solve for x
    x = 1,321,460.86/1,213.36
  6. Step 6: Final answer
    x = 1,089.09

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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.