Home / 1,291.36-1,777.60-1,123.20

Finding the Fourth Proportional to 1,291.36, 1,777.60 and 1,123.20

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Solution

The fourth proportional to 1,291.36, 1,777.60 and 1,123.20 is: 1,546.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.36 : 1,777.60 = 1,123.20 : x
  2. Step 2: Convert to fraction form
    1,291.36/1,777.60 = 1,123.20/x
  3. Step 3: Cross multiply
    1,291.36x = 1,777.60 × 1,123.20
  4. Step 4: Simplify right side
    1,291.36x = 1,996,600.32
  5. Step 5: Solve for x
    x = 1,996,600.32/1,291.36
  6. Step 6: Final answer
    x = 1,546.12

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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.