Home / 5,420.16-8,129.39-1,721.90

Finding the Fourth Proportional to 5,420.16, 8,129.39 and 1,721.90

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Solution

The fourth proportional to 5,420.16, 8,129.39 and 1,721.90 is: 2,582.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,420.16 : 8,129.39 = 1,721.90 : x
  2. Step 2: Convert to fraction form
    5,420.16/8,129.39 = 1,721.90/x
  3. Step 3: Cross multiply
    5,420.16x = 8,129.39 × 1,721.90
  4. Step 4: Simplify right side
    5,420.16x = 13,997,988.03
  5. Step 5: Solve for x
    x = 13,997,988.03/5,420.16
  6. Step 6: Final answer
    x = 2,582.58

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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.