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Finding the Fourth Proportional to 2,113, 2,916 and 1,181.56

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Solution

The fourth proportional to 2,113, 2,916 and 1,181.56 is: 1,630.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,113 : 2,916 = 1,181.56 : x
  2. Step 2: Convert to fraction form
    2,113/2,916 = 1,181.56/x
  3. Step 3: Cross multiply
    2,113x = 2,916 × 1,181.56
  4. Step 4: Simplify right side
    2,113x = 3,445,428.96
  5. Step 5: Solve for x
    x = 3,445,428.96/2,113
  6. Step 6: Final answer
    x = 1,630.59

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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.