Home / 5,639.68-7,782.84-3,121.60

Finding the Fourth Proportional to 5,639.68, 7,782.84 and 3,121.60

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Solution

The fourth proportional to 5,639.68, 7,782.84 and 3,121.60 is: 4,307.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,639.68 : 7,782.84 = 3,121.60 : x
  2. Step 2: Convert to fraction form
    5,639.68/7,782.84 = 3,121.60/x
  3. Step 3: Cross multiply
    5,639.68x = 7,782.84 × 3,121.60
  4. Step 4: Simplify right side
    5,639.68x = 24,294,913.34
  5. Step 5: Solve for x
    x = 24,294,913.34/5,639.68
  6. Step 6: Final answer
    x = 4,307.85

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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.