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Finding the Fourth Proportional to 1,971.95, 2,956.43 and 931.33

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Solution

The fourth proportional to 1,971.95, 2,956.43 and 931.33 is: 1,396.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,971.95 : 2,956.43 = 931.33 : x
  2. Step 2: Convert to fraction form
    1,971.95/2,956.43 = 931.33/x
  3. Step 3: Cross multiply
    1,971.95x = 2,956.43 × 931.33
  4. Step 4: Simplify right side
    1,971.95x = 2,753,417.98
  5. Step 5: Solve for x
    x = 2,753,417.98/1,971.95
  6. Step 6: Final answer
    x = 1,396.30

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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.