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Finding the Fourth Proportional to 1,970.56, 2,955.87 and 931.30

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Solution

The fourth proportional to 1,970.56, 2,955.87 and 931.30 is: 1,396.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,970.56 : 2,955.87 = 931.30 : x
  2. Step 2: Convert to fraction form
    1,970.56/2,955.87 = 931.30/x
  3. Step 3: Cross multiply
    1,970.56x = 2,955.87 × 931.30
  4. Step 4: Simplify right side
    1,970.56x = 2,752,801.73
  5. Step 5: Solve for x
    x = 2,752,801.73/1,970.56
  6. Step 6: Final answer
    x = 1,396.96

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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.