Home / 1,539.77-2,121.12-1,291.10

Finding the Fourth Proportional to 1,539.77, 2,121.12 and 1,291.10

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Solution

The fourth proportional to 1,539.77, 2,121.12 and 1,291.10 is: 1,778.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,539.77 : 2,121.12 = 1,291.10 : x
  2. Step 2: Convert to fraction form
    1,539.77/2,121.12 = 1,291.10/x
  3. Step 3: Cross multiply
    1,539.77x = 2,121.12 × 1,291.10
  4. Step 4: Simplify right side
    1,539.77x = 2,738,567.43
  5. Step 5: Solve for x
    x = 2,738,567.43/1,539.77
  6. Step 6: Final answer
    x = 1,778.56

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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.