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Finding the Fourth Proportional to 3,182.86, 4,774.29 and 991

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Solution

The fourth proportional to 3,182.86, 4,774.29 and 991 is: 1,486.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,182.86 : 4,774.29 = 991 : x
  2. Step 2: Convert to fraction form
    3,182.86/4,774.29 = 991/x
  3. Step 3: Cross multiply
    3,182.86x = 4,774.29 × 991
  4. Step 4: Simplify right side
    3,182.86x = 4,731,321.39
  5. Step 5: Solve for x
    x = 4,731,321.39/3,182.86
  6. Step 6: Final answer
    x = 1,486.50

Related Problems

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Half scale
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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.