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Finding the Fourth Proportional to 890.39, 1,228.74 and 541.28

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Solution

The fourth proportional to 890.39, 1,228.74 and 541.28 is: 746.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.39 : 1,228.74 = 541.28 : x
  2. Step 2: Convert to fraction form
    890.39/1,228.74 = 541.28/x
  3. Step 3: Cross multiply
    890.39x = 1,228.74 × 541.28
  4. Step 4: Simplify right side
    890.39x = 665,092.39
  5. Step 5: Solve for x
    x = 665,092.39/890.39
  6. Step 6: Final answer
    x = 746.97

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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.