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Finding the Fourth Proportional to 1,955.80, 2,698.90 and 1,071.55

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Solution

The fourth proportional to 1,955.80, 2,698.90 and 1,071.55 is: 1,478.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,955.80 : 2,698.90 = 1,071.55 : x
  2. Step 2: Convert to fraction form
    1,955.80/2,698.90 = 1,071.55/x
  3. Step 3: Cross multiply
    1,955.80x = 2,698.90 × 1,071.55
  4. Step 4: Simplify right side
    1,955.80x = 2,892,006.30
  5. Step 5: Solve for x
    x = 2,892,006.30/1,955.80
  6. Step 6: Final answer
    x = 1,478.68

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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.