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Finding the Fourth Proportional to 1,971.16, 2,720.16 and 1,086.96

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Solution

The fourth proportional to 1,971.16, 2,720.16 and 1,086.96 is: 1,499.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,971.16 : 2,720.16 = 1,086.96 : x
  2. Step 2: Convert to fraction form
    1,971.16/2,720.16 = 1,086.96/x
  3. Step 3: Cross multiply
    1,971.16x = 2,720.16 × 1,086.96
  4. Step 4: Simplify right side
    1,971.16x = 2,956,705.11
  5. Step 5: Solve for x
    x = 2,956,705.11/1,971.16
  6. Step 6: Final answer
    x = 1,499.98

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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.