Home / 1,980.86-2,732.94-1,317.80

Finding the Fourth Proportional to 1,980.86, 2,732.94 and 1,317.80

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Solution

The fourth proportional to 1,980.86, 2,732.94 and 1,317.80 is: 1,818.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,980.86 : 2,732.94 = 1,317.80 : x
  2. Step 2: Convert to fraction form
    1,980.86/2,732.94 = 1,317.80/x
  3. Step 3: Cross multiply
    1,980.86x = 2,732.94 × 1,317.80
  4. Step 4: Simplify right side
    1,980.86x = 3,601,475.16
  5. Step 5: Solve for x
    x = 3,601,475.16/1,980.86
  6. Step 6: Final answer
    x = 1,818.14

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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.