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Finding the Fourth Proportional to 890.23, 1,228.69 and 554.25

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Solution

The fourth proportional to 890.23, 1,228.69 and 554.25 is: 764.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.23 : 1,228.69 = 554.25 : x
  2. Step 2: Convert to fraction form
    890.23/1,228.69 = 554.25/x
  3. Step 3: Cross multiply
    890.23x = 1,228.69 × 554.25
  4. Step 4: Simplify right side
    890.23x = 681,001.43
  5. Step 5: Solve for x
    x = 681,001.43/890.23
  6. Step 6: Final answer
    x = 764.97

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Double scale
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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.