Home / 1,387.04-2,078.64-1,112

Finding the Fourth Proportional to 1,387.04, 2,078.64 and 1,112

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Solution

The fourth proportional to 1,387.04, 2,078.64 and 1,112 is: 1,666.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.04 : 2,078.64 = 1,112 : x
  2. Step 2: Convert to fraction form
    1,387.04/2,078.64 = 1,112/x
  3. Step 3: Cross multiply
    1,387.04x = 2,078.64 × 1,112
  4. Step 4: Simplify right side
    1,387.04x = 2,311,447.68
  5. Step 5: Solve for x
    x = 2,311,447.68/1,387.04
  6. Step 6: Final answer
    x = 1,666.46

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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.