Home / 1,120.32-1,547.40-789.84

Finding the Fourth Proportional to 1,120.32, 1,547.40 and 789.84

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Solution

The fourth proportional to 1,120.32, 1,547.40 and 789.84 is: 1,090.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,120.32 : 1,547.40 = 789.84 : x
  2. Step 2: Convert to fraction form
    1,120.32/1,547.40 = 789.84/x
  3. Step 3: Cross multiply
    1,120.32x = 1,547.40 × 789.84
  4. Step 4: Simplify right side
    1,120.32x = 1,222,198.42
  5. Step 5: Solve for x
    x = 1,222,198.42/1,120.32
  6. Step 6: Final answer
    x = 1,090.94

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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.