Home / 1,821.86-2,515.75-1,428.20

Finding the Fourth Proportional to 1,821.86, 2,515.75 and 1,428.20

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Solution

The fourth proportional to 1,821.86, 2,515.75 and 1,428.20 is: 1,972.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,821.86 : 2,515.75 = 1,428.20 : x
  2. Step 2: Convert to fraction form
    1,821.86/2,515.75 = 1,428.20/x
  3. Step 3: Cross multiply
    1,821.86x = 2,515.75 × 1,428.20
  4. Step 4: Simplify right side
    1,821.86x = 3,592,978.00
  5. Step 5: Solve for x
    x = 3,592,978.00/1,821.86
  6. Step 6: Final answer
    x = 1,972.15

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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.