Home / 1,720.28-2,580.20-487.80

Finding the Fourth Proportional to 1,720.28, 2,580.20 and 487.80

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Solution

The fourth proportional to 1,720.28, 2,580.20 and 487.80 is: 731.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,720.28 : 2,580.20 = 487.80 : x
  2. Step 2: Convert to fraction form
    1,720.28/2,580.20 = 487.80/x
  3. Step 3: Cross multiply
    1,720.28x = 2,580.20 × 487.80
  4. Step 4: Simplify right side
    1,720.28x = 1,258,621.56
  5. Step 5: Solve for x
    x = 1,258,621.56/1,720.28
  6. Step 6: Final answer
    x = 731.64

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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.