Home / 1,985.56-2,720.18-1,911.70

Finding the Fourth Proportional to 1,985.56, 2,720.18 and 1,911.70

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Solution

The fourth proportional to 1,985.56, 2,720.18 and 1,911.70 is: 2,618.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,985.56 : 2,720.18 = 1,911.70 : x
  2. Step 2: Convert to fraction form
    1,985.56/2,720.18 = 1,911.70/x
  3. Step 3: Cross multiply
    1,985.56x = 2,720.18 × 1,911.70
  4. Step 4: Simplify right side
    1,985.56x = 5,200,168.11
  5. Step 5: Solve for x
    x = 5,200,168.11/1,985.56
  6. Step 6: Final answer
    x = 2,618.99

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.