Home / 2,118.78-3,177.40-731.76

Finding the Fourth Proportional to 2,118.78, 3,177.40 and 731.76

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Solution

The fourth proportional to 2,118.78, 3,177.40 and 731.76 is: 1,097.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,118.78 : 3,177.40 = 731.76 : x
  2. Step 2: Convert to fraction form
    2,118.78/3,177.40 = 731.76/x
  3. Step 3: Cross multiply
    2,118.78x = 3,177.40 × 731.76
  4. Step 4: Simplify right side
    2,118.78x = 2,325,094.22
  5. Step 5: Solve for x
    x = 2,325,094.22/2,118.78
  6. Step 6: Final answer
    x = 1,097.37

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1.5x scale

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.