Home / 2,720.10-4,080.15-1,985.70

Finding the Fourth Proportional to 2,720.10, 4,080.15 and 1,985.70

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Solution

The fourth proportional to 2,720.10, 4,080.15 and 1,985.70 is: 2,978.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,720.10 : 4,080.15 = 1,985.70 : x
  2. Step 2: Convert to fraction form
    2,720.10/4,080.15 = 1,985.70/x
  3. Step 3: Cross multiply
    2,720.10x = 4,080.15 × 1,985.70
  4. Step 4: Simplify right side
    2,720.10x = 8,101,953.86
  5. Step 5: Solve for x
    x = 8,101,953.86/2,720.10
  6. Step 6: Final answer
    x = 2,978.55

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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.