Home / 2,117.80-2,922-1,221.52

Finding the Fourth Proportional to 2,117.80, 2,922 and 1,221.52

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Solution

The fourth proportional to 2,117.80, 2,922 and 1,221.52 is: 1,685.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,117.80 : 2,922 = 1,221.52 : x
  2. Step 2: Convert to fraction form
    2,117.80/2,922 = 1,221.52/x
  3. Step 3: Cross multiply
    2,117.80x = 2,922 × 1,221.52
  4. Step 4: Simplify right side
    2,117.80x = 3,569,281.44
  5. Step 5: Solve for x
    x = 3,569,281.44/2,117.80
  6. Step 6: Final answer
    x = 1,685.37

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1.5x scale

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.