Home / 1,116.78-1,539.45-919.92

Finding the Fourth Proportional to 1,116.78, 1,539.45 and 919.92

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Solution

The fourth proportional to 1,116.78, 1,539.45 and 919.92 is: 1,268.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,116.78 : 1,539.45 = 919.92 : x
  2. Step 2: Convert to fraction form
    1,116.78/1,539.45 = 919.92/x
  3. Step 3: Cross multiply
    1,116.78x = 1,539.45 × 919.92
  4. Step 4: Simplify right side
    1,116.78x = 1,416,170.84
  5. Step 5: Solve for x
    x = 1,416,170.84/1,116.78
  6. Step 6: Final answer
    x = 1,268.08

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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.