Home / 5,419.81-8,130.40-1,720.72

Finding the Fourth Proportional to 5,419.81, 8,130.40 and 1,720.72

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Solution

The fourth proportional to 5,419.81, 8,130.40 and 1,720.72 is: 2,581.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,419.81 : 8,130.40 = 1,720.72 : x
  2. Step 2: Convert to fraction form
    5,419.81/8,130.40 = 1,720.72/x
  3. Step 3: Cross multiply
    5,419.81x = 8,130.40 × 1,720.72
  4. Step 4: Simplify right side
    5,419.81x = 13,990,141.89
  5. Step 5: Solve for x
    x = 13,990,141.89/5,419.81
  6. Step 6: Final answer
    x = 2,581.30

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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.