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Finding the Fourth Proportional to 991.36, 1,486.84 and 333.16

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Solution

The fourth proportional to 991.36, 1,486.84 and 333.16 is: 499.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.36 : 1,486.84 = 333.16 : x
  2. Step 2: Convert to fraction form
    991.36/1,486.84 = 333.16/x
  3. Step 3: Cross multiply
    991.36x = 1,486.84 × 333.16
  4. Step 4: Simplify right side
    991.36x = 495,360.05
  5. Step 5: Solve for x
    x = 495,360.05/991.36
  6. Step 6: Final answer
    x = 499.68

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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.