Home / 2,780.64-4,172.38-1,319.81

Finding the Fourth Proportional to 2,780.64, 4,172.38 and 1,319.81

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Solution

The fourth proportional to 2,780.64, 4,172.38 and 1,319.81 is: 1,980.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,780.64 : 4,172.38 = 1,319.81 : x
  2. Step 2: Convert to fraction form
    2,780.64/4,172.38 = 1,319.81/x
  3. Step 3: Cross multiply
    2,780.64x = 4,172.38 × 1,319.81
  4. Step 4: Simplify right side
    2,780.64x = 5,506,724.69
  5. Step 5: Solve for x
    x = 5,506,724.69/2,780.64
  6. Step 6: Final answer
    x = 1,980.38

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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.