Home / 1,291.24-1,783.14-1,288.60

Finding the Fourth Proportional to 1,291.24, 1,783.14 and 1,288.60

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Solution

The fourth proportional to 1,291.24, 1,783.14 and 1,288.60 is: 1,779.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.24 : 1,783.14 = 1,288.60 : x
  2. Step 2: Convert to fraction form
    1,291.24/1,783.14 = 1,288.60/x
  3. Step 3: Cross multiply
    1,291.24x = 1,783.14 × 1,288.60
  4. Step 4: Simplify right side
    1,291.24x = 2,297,754.20
  5. Step 5: Solve for x
    x = 2,297,754.20/1,291.24
  6. Step 6: Final answer
    x = 1,779.49

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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.