Home / 5,639.85-7,782.93-3,121.98

Finding the Fourth Proportional to 5,639.85, 7,782.93 and 3,121.98

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Solution

The fourth proportional to 5,639.85, 7,782.93 and 3,121.98 is: 4,308.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,639.85 : 7,782.93 = 3,121.98 : x
  2. Step 2: Convert to fraction form
    5,639.85/7,782.93 = 3,121.98/x
  3. Step 3: Cross multiply
    5,639.85x = 7,782.93 × 3,121.98
  4. Step 4: Simplify right side
    5,639.85x = 24,298,151.80
  5. Step 5: Solve for x
    x = 24,298,151.80/5,639.85
  6. Step 6: Final answer
    x = 4,308.30

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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.