Home / 6,515.72-8,990.34-3,720.68

Finding the Fourth Proportional to 6,515.72, 8,990.34 and 3,720.68

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Solution

The fourth proportional to 6,515.72, 8,990.34 and 3,720.68 is: 5,133.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,515.72 : 8,990.34 = 3,720.68 : x
  2. Step 2: Convert to fraction form
    6,515.72/8,990.34 = 3,720.68/x
  3. Step 3: Cross multiply
    6,515.72x = 8,990.34 × 3,720.68
  4. Step 4: Simplify right side
    6,515.72x = 33,450,178.23
  5. Step 5: Solve for x
    x = 33,450,178.23/6,515.72
  6. Step 6: Final answer
    x = 5,133.77

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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.