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Finding the Fourth Proportional to 2,113.90, 3,170.92 and 653.18

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Solution

The fourth proportional to 2,113.90, 3,170.92 and 653.18 is: 979.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,113.90 : 3,170.92 = 653.18 : x
  2. Step 2: Convert to fraction form
    2,113.90/3,170.92 = 653.18/x
  3. Step 3: Cross multiply
    2,113.90x = 3,170.92 × 653.18
  4. Step 4: Simplify right side
    2,113.90x = 2,071,181.53
  5. Step 5: Solve for x
    x = 2,071,181.53/2,113.90
  6. Step 6: Final answer
    x = 979.79

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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.