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Finding the Fourth Proportional to 1,927.70, 2,891.48 and 611.45

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Solution

The fourth proportional to 1,927.70, 2,891.48 and 611.45 is: 917.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,927.70 : 2,891.48 = 611.45 : x
  2. Step 2: Convert to fraction form
    1,927.70/2,891.48 = 611.45/x
  3. Step 3: Cross multiply
    1,927.70x = 2,891.48 × 611.45
  4. Step 4: Simplify right side
    1,927.70x = 1,767,977.93
  5. Step 5: Solve for x
    x = 1,767,977.93/1,927.70
  6. Step 6: Final answer
    x = 917.15

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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.