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Finding the Fourth Proportional to 1,890.55, 2,608.90 and 1,191.25

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Solution

The fourth proportional to 1,890.55, 2,608.90 and 1,191.25 is: 1,643.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,890.55 : 2,608.90 = 1,191.25 : x
  2. Step 2: Convert to fraction form
    1,890.55/2,608.90 = 1,191.25/x
  3. Step 3: Cross multiply
    1,890.55x = 2,608.90 × 1,191.25
  4. Step 4: Simplify right side
    1,890.55x = 3,107,852.13
  5. Step 5: Solve for x
    x = 3,107,852.13/1,890.55
  6. Step 6: Final answer
    x = 1,643.89

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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.