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Finding the Fourth Proportional to 890.89, 1,334.41 and 646.88

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Solution

The fourth proportional to 890.89, 1,334.41 and 646.88 is: 968.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.89 : 1,334.41 = 646.88 : x
  2. Step 2: Convert to fraction form
    890.89/1,334.41 = 646.88/x
  3. Step 3: Cross multiply
    890.89x = 1,334.41 × 646.88
  4. Step 4: Simplify right side
    890.89x = 863,194.85
  5. Step 5: Solve for x
    x = 863,194.85/890.89
  6. Step 6: Final answer
    x = 968.92

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Double scale
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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.