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Finding the Fourth Proportional to 890.43, 1,219.89 and 857.18

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Solution

The fourth proportional to 890.43, 1,219.89 and 857.18 is: 1,174.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.43 : 1,219.89 = 857.18 : x
  2. Step 2: Convert to fraction form
    890.43/1,219.89 = 857.18/x
  3. Step 3: Cross multiply
    890.43x = 1,219.89 × 857.18
  4. Step 4: Simplify right side
    890.43x = 1,045,659.21
  5. Step 5: Solve for x
    x = 1,045,659.21/890.43
  6. Step 6: Final answer
    x = 1,174.33

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.