Home / 1,550.40-2,139.51-851.79

Finding the Fourth Proportional to 1,550.40, 2,139.51 and 851.79

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Solution

The fourth proportional to 1,550.40, 2,139.51 and 851.79 is: 1,175.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,550.40 : 2,139.51 = 851.79 : x
  2. Step 2: Convert to fraction form
    1,550.40/2,139.51 = 851.79/x
  3. Step 3: Cross multiply
    1,550.40x = 2,139.51 × 851.79
  4. Step 4: Simplify right side
    1,550.40x = 1,822,413.22
  5. Step 5: Solve for x
    x = 1,822,413.22/1,550.40
  6. Step 6: Final answer
    x = 1,175.45

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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.