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Finding the Fourth Proportional to 1,807.74, 2,494.90 and 1,021.78

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Solution

The fourth proportional to 1,807.74, 2,494.90 and 1,021.78 is: 1,410.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,807.74 : 2,494.90 = 1,021.78 : x
  2. Step 2: Convert to fraction form
    1,807.74/2,494.90 = 1,021.78/x
  3. Step 3: Cross multiply
    1,807.74x = 2,494.90 × 1,021.78
  4. Step 4: Simplify right side
    1,807.74x = 2,549,238.92
  5. Step 5: Solve for x
    x = 2,549,238.92/1,807.74
  6. Step 6: Final answer
    x = 1,410.18

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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.