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Finding the Fourth Proportional to 991.67, 1,487.51 and 298.34

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Solution

The fourth proportional to 991.67, 1,487.51 and 298.34 is: 447.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.67 : 1,487.51 = 298.34 : x
  2. Step 2: Convert to fraction form
    991.67/1,487.51 = 298.34/x
  3. Step 3: Cross multiply
    991.67x = 1,487.51 × 298.34
  4. Step 4: Simplify right side
    991.67x = 443,783.73
  5. Step 5: Solve for x
    x = 443,783.73/991.67
  6. Step 6: Final answer
    x = 447.51

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Double scale
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Similar ratio
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1.5x scale

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.