Home / 1,421.07-2,131.61-842.19

Finding the Fourth Proportional to 1,421.07, 2,131.61 and 842.19

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Solution

The fourth proportional to 1,421.07, 2,131.61 and 842.19 is: 1,263.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.07 : 2,131.61 = 842.19 : x
  2. Step 2: Convert to fraction form
    1,421.07/2,131.61 = 842.19/x
  3. Step 3: Cross multiply
    1,421.07x = 2,131.61 × 842.19
  4. Step 4: Simplify right side
    1,421.07x = 1,795,216.41
  5. Step 5: Solve for x
    x = 1,795,216.41/1,421.07
  6. Step 6: Final answer
    x = 1,263.29

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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.