Home / 5,639.40-7,782.27-3,121.52

Finding the Fourth Proportional to 5,639.40, 7,782.27 and 3,121.52

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Solution

The fourth proportional to 5,639.40, 7,782.27 and 3,121.52 is: 4,307.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,639.40 : 7,782.27 = 3,121.52 : x
  2. Step 2: Convert to fraction form
    5,639.40/7,782.27 = 3,121.52/x
  3. Step 3: Cross multiply
    5,639.40x = 7,782.27 × 3,121.52
  4. Step 4: Simplify right side
    5,639.40x = 24,292,511.45
  5. Step 5: Solve for x
    x = 24,292,511.45/5,639.40
  6. Step 6: Final answer
    x = 4,307.64

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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.