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Finding the Fourth Proportional to 1,550.75, 2,139.62 and 990.23

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Solution

The fourth proportional to 1,550.75, 2,139.62 and 990.23 is: 1,366.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,550.75 : 2,139.62 = 990.23 : x
  2. Step 2: Convert to fraction form
    1,550.75/2,139.62 = 990.23/x
  3. Step 3: Cross multiply
    1,550.75x = 2,139.62 × 990.23
  4. Step 4: Simplify right side
    1,550.75x = 2,118,700.26
  5. Step 5: Solve for x
    x = 2,118,700.26/1,550.75
  6. Step 6: Final answer
    x = 1,366.25

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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.