Home / 5,639.55-7,782.07-3,121.62

Finding the Fourth Proportional to 5,639.55, 7,782.07 and 3,121.62

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Solution

The fourth proportional to 5,639.55, 7,782.07 and 3,121.62 is: 4,307.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,639.55 : 7,782.07 = 3,121.62 : x
  2. Step 2: Convert to fraction form
    5,639.55/7,782.07 = 3,121.62/x
  3. Step 3: Cross multiply
    5,639.55x = 7,782.07 × 3,121.62
  4. Step 4: Simplify right side
    5,639.55x = 24,292,665.35
  5. Step 5: Solve for x
    x = 24,292,665.35/5,639.55
  6. Step 6: Final answer
    x = 4,307.55

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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.