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Finding the Fourth Proportional to 1,859.70, 2,790.45 and 1,420.80

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Solution

The fourth proportional to 1,859.70, 2,790.45 and 1,420.80 is: 2,131.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,859.70 : 2,790.45 = 1,420.80 : x
  2. Step 2: Convert to fraction form
    1,859.70/2,790.45 = 1,420.80/x
  3. Step 3: Cross multiply
    1,859.70x = 2,790.45 × 1,420.80
  4. Step 4: Simplify right side
    1,859.70x = 3,964,671.36
  5. Step 5: Solve for x
    x = 3,964,671.36/1,859.70
  6. Step 6: Final answer
    x = 2,131.89

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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.