Home / 2,781.51-4,172.72-1,319.87

Finding the Fourth Proportional to 2,781.51, 4,172.72 and 1,319.87

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Solution

The fourth proportional to 2,781.51, 4,172.72 and 1,319.87 is: 1,980.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,781.51 : 4,172.72 = 1,319.87 : x
  2. Step 2: Convert to fraction form
    2,781.51/4,172.72 = 1,319.87/x
  3. Step 3: Cross multiply
    2,781.51x = 4,172.72 × 1,319.87
  4. Step 4: Simplify right side
    2,781.51x = 5,507,420.48
  5. Step 5: Solve for x
    x = 5,507,420.48/2,781.51
  6. Step 6: Final answer
    x = 1,980.01

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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.