Home / 5,638.81-7,782.09-3,121.51

Finding the Fourth Proportional to 5,638.81, 7,782.09 and 3,121.51

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Solution

The fourth proportional to 5,638.81, 7,782.09 and 3,121.51 is: 4,307.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,638.81 : 7,782.09 = 3,121.51 : x
  2. Step 2: Convert to fraction form
    5,638.81/7,782.09 = 3,121.51/x
  3. Step 3: Cross multiply
    5,638.81x = 7,782.09 × 3,121.51
  4. Step 4: Simplify right side
    5,638.81x = 24,291,871.76
  5. Step 5: Solve for x
    x = 24,291,871.76/5,638.81
  6. Step 6: Final answer
    x = 4,307.98

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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.