Home / 4,985.28-6,879.60-2,889.60

Finding the Fourth Proportional to 4,985.28, 6,879.60 and 2,889.60

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Solution

The fourth proportional to 4,985.28, 6,879.60 and 2,889.60 is: 3,987.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,985.28 : 6,879.60 = 2,889.60 : x
  2. Step 2: Convert to fraction form
    4,985.28/6,879.60 = 2,889.60/x
  3. Step 3: Cross multiply
    4,985.28x = 6,879.60 × 2,889.60
  4. Step 4: Simplify right side
    4,985.28x = 19,879,292.16
  5. Step 5: Solve for x
    x = 19,879,292.16/4,985.28
  6. Step 6: Final answer
    x = 3,987.60

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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.