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Finding the Fourth Proportional to 1,866.81, 2,798.58 and 711.75

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Solution

The fourth proportional to 1,866.81, 2,798.58 and 711.75 is: 1,067.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,866.81 : 2,798.58 = 711.75 : x
  2. Step 2: Convert to fraction form
    1,866.81/2,798.58 = 711.75/x
  3. Step 3: Cross multiply
    1,866.81x = 2,798.58 × 711.75
  4. Step 4: Simplify right side
    1,866.81x = 1,991,889.32
  5. Step 5: Solve for x
    x = 1,991,889.32/1,866.81
  6. Step 6: Final answer
    x = 1,067.00

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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.