Home / 1,557.47-2,149.31-858.85

Finding the Fourth Proportional to 1,557.47, 2,149.31 and 858.85

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Solution

The fourth proportional to 1,557.47, 2,149.31 and 858.85 is: 1,185.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,557.47 : 2,149.31 = 858.85 : x
  2. Step 2: Convert to fraction form
    1,557.47/2,149.31 = 858.85/x
  3. Step 3: Cross multiply
    1,557.47x = 2,149.31 × 858.85
  4. Step 4: Simplify right side
    1,557.47x = 1,845,930.87
  5. Step 5: Solve for x
    x = 1,845,930.87/1,557.47
  6. Step 6: Final answer
    x = 1,185.21

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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.