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Finding the Fourth Proportional to 889.26, 1,228.32 and 721.83

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Solution

The fourth proportional to 889.26, 1,228.32 and 721.83 is: 997.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.26 : 1,228.32 = 721.83 : x
  2. Step 2: Convert to fraction form
    889.26/1,228.32 = 721.83/x
  3. Step 3: Cross multiply
    889.26x = 1,228.32 × 721.83
  4. Step 4: Simplify right side
    889.26x = 886,638.23
  5. Step 5: Solve for x
    x = 886,638.23/889.26
  6. Step 6: Final answer
    x = 997.05

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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.