Home / 2,985.78-4,120.38-1,659.50

Finding the Fourth Proportional to 2,985.78, 4,120.38 and 1,659.50

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Solution

The fourth proportional to 2,985.78, 4,120.38 and 1,659.50 is: 2,290.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,985.78 : 4,120.38 = 1,659.50 : x
  2. Step 2: Convert to fraction form
    2,985.78/4,120.38 = 1,659.50/x
  3. Step 3: Cross multiply
    2,985.78x = 4,120.38 × 1,659.50
  4. Step 4: Simplify right side
    2,985.78x = 6,837,750.01
  5. Step 5: Solve for x
    x = 6,837,750.01/2,985.78
  6. Step 6: Final answer
    x = 2,290.11

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.