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Finding the Fourth Proportional to 1,865.83, 2,798.38 and 711.31

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Solution

The fourth proportional to 1,865.83, 2,798.38 and 711.31 is: 1,066.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,865.83 : 2,798.38 = 711.31 : x
  2. Step 2: Convert to fraction form
    1,865.83/2,798.38 = 711.31/x
  3. Step 3: Cross multiply
    1,865.83x = 2,798.38 × 711.31
  4. Step 4: Simplify right side
    1,865.83x = 1,990,515.68
  5. Step 5: Solve for x
    x = 1,990,515.68/1,865.83
  6. Step 6: Final answer
    x = 1,066.83

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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.