Home / 1,615.23-2,228.58-1,221.57

Finding the Fourth Proportional to 1,615.23, 2,228.58 and 1,221.57

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Solution

The fourth proportional to 1,615.23, 2,228.58 and 1,221.57 is: 1,685.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,615.23 : 2,228.58 = 1,221.57 : x
  2. Step 2: Convert to fraction form
    1,615.23/2,228.58 = 1,221.57/x
  3. Step 3: Cross multiply
    1,615.23x = 2,228.58 × 1,221.57
  4. Step 4: Simplify right side
    1,615.23x = 2,722,366.47
  5. Step 5: Solve for x
    x = 2,722,366.47/1,615.23
  6. Step 6: Final answer
    x = 1,685.44

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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.