Home / 2,720.40-4,081.68-1,420.08

Finding the Fourth Proportional to 2,720.40, 4,081.68 and 1,420.08

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Solution

The fourth proportional to 2,720.40, 4,081.68 and 1,420.08 is: 2,130.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,720.40 : 4,081.68 = 1,420.08 : x
  2. Step 2: Convert to fraction form
    2,720.40/4,081.68 = 1,420.08/x
  3. Step 3: Cross multiply
    2,720.40x = 4,081.68 × 1,420.08
  4. Step 4: Simplify right side
    2,720.40x = 5,796,312.13
  5. Step 5: Solve for x
    x = 5,796,312.13/2,720.40
  6. Step 6: Final answer
    x = 2,130.68

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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.