Home / 1,557.41-2,149.21-858.78

Finding the Fourth Proportional to 1,557.41, 2,149.21 and 858.78

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Solution

The fourth proportional to 1,557.41, 2,149.21 and 858.78 is: 1,185.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,557.41 : 2,149.21 = 858.78 : x
  2. Step 2: Convert to fraction form
    1,557.41/2,149.21 = 858.78/x
  3. Step 3: Cross multiply
    1,557.41x = 2,149.21 × 858.78
  4. Step 4: Simplify right side
    1,557.41x = 1,845,698.56
  5. Step 5: Solve for x
    x = 1,845,698.56/1,557.41
  6. Step 6: Final answer
    x = 1,185.11

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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.