Home / 1,689.90-2,331.95-1,291.83

Finding the Fourth Proportional to 1,689.90, 2,331.95 and 1,291.83

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Solution

The fourth proportional to 1,689.90, 2,331.95 and 1,291.83 is: 1,782.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,689.90 : 2,331.95 = 1,291.83 : x
  2. Step 2: Convert to fraction form
    1,689.90/2,331.95 = 1,291.83/x
  3. Step 3: Cross multiply
    1,689.90x = 2,331.95 × 1,291.83
  4. Step 4: Simplify right side
    1,689.90x = 3,012,467.76
  5. Step 5: Solve for x
    x = 3,012,467.76/1,689.90
  6. Step 6: Final answer
    x = 1,782.63

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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.