Home / 1,448.20-1,998.60-858.70

Finding the Fourth Proportional to 1,448.20, 1,998.60 and 858.70

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Solution

The fourth proportional to 1,448.20, 1,998.60 and 858.70 is: 1,185.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,448.20 : 1,998.60 = 858.70 : x
  2. Step 2: Convert to fraction form
    1,448.20/1,998.60 = 858.70/x
  3. Step 3: Cross multiply
    1,448.20x = 1,998.60 × 858.70
  4. Step 4: Simplify right side
    1,448.20x = 1,716,197.82
  5. Step 5: Solve for x
    x = 1,716,197.82/1,448.20
  6. Step 6: Final answer
    x = 1,185.06

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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.