Home / 2,124.20-3,185.16-643.22

Finding the Fourth Proportional to 2,124.20, 3,185.16 and 643.22

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Solution

The fourth proportional to 2,124.20, 3,185.16 and 643.22 is: 964.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,124.20 : 3,185.16 = 643.22 : x
  2. Step 2: Convert to fraction form
    2,124.20/3,185.16 = 643.22/x
  3. Step 3: Cross multiply
    2,124.20x = 3,185.16 × 643.22
  4. Step 4: Simplify right side
    2,124.20x = 2,048,758.62
  5. Step 5: Solve for x
    x = 2,048,758.62/2,124.20
  6. Step 6: Final answer
    x = 964.48

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.