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Finding the Fourth Proportional to 1,550.42, 2,139.60 and 878.26

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Solution

The fourth proportional to 1,550.42, 2,139.60 and 878.26 is: 1,212.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,550.42 : 2,139.60 = 878.26 : x
  2. Step 2: Convert to fraction form
    1,550.42/2,139.60 = 878.26/x
  3. Step 3: Cross multiply
    1,550.42x = 2,139.60 × 878.26
  4. Step 4: Simplify right side
    1,550.42x = 1,879,125.10
  5. Step 5: Solve for x
    x = 1,879,125.10/1,550.42
  6. Step 6: Final answer
    x = 1,212.01

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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.