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Finding the Fourth Proportional to 1,218.95, 1,828.88 and 890.19

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Solution

The fourth proportional to 1,218.95, 1,828.88 and 890.19 is: 1,335.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,218.95 : 1,828.88 = 890.19 : x
  2. Step 2: Convert to fraction form
    1,218.95/1,828.88 = 890.19/x
  3. Step 3: Cross multiply
    1,218.95x = 1,828.88 × 890.19
  4. Step 4: Simplify right side
    1,218.95x = 1,628,049.57
  5. Step 5: Solve for x
    x = 1,628,049.57/1,218.95
  6. Step 6: Final answer
    x = 1,335.62

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.