Home / 1,555.72-2,321.39-1,392.28

Finding the Fourth Proportional to 1,555.72, 2,321.39 and 1,392.28

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Solution

The fourth proportional to 1,555.72, 2,321.39 and 1,392.28 is: 2,077.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,555.72 : 2,321.39 = 1,392.28 : x
  2. Step 2: Convert to fraction form
    1,555.72/2,321.39 = 1,392.28/x
  3. Step 3: Cross multiply
    1,555.72x = 2,321.39 × 1,392.28
  4. Step 4: Simplify right side
    1,555.72x = 3,232,024.87
  5. Step 5: Solve for x
    x = 3,232,024.87/1,555.72
  6. Step 6: Final answer
    x = 2,077.51

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.