Home / 6,515.28-8,991.60-3,720.72

Finding the Fourth Proportional to 6,515.28, 8,991.60 and 3,720.72

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Solution

The fourth proportional to 6,515.28, 8,991.60 and 3,720.72 is: 5,134.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,515.28 : 8,991.60 = 3,720.72 : x
  2. Step 2: Convert to fraction form
    6,515.28/8,991.60 = 3,720.72/x
  3. Step 3: Cross multiply
    6,515.28x = 8,991.60 × 3,720.72
  4. Step 4: Simplify right side
    6,515.28x = 33,455,225.95
  5. Step 5: Solve for x
    x = 33,455,225.95/6,515.28
  6. Step 6: Final answer
    x = 5,134.89

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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.