Home / 13,420.08-18,519.84-7,830

Finding the Fourth Proportional to 13,420.08, 18,519.84 and 7,830

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Solution

The fourth proportional to 13,420.08, 18,519.84 and 7,830 is: 10,805.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,420.08 : 18,519.84 = 7,830 : x
  2. Step 2: Convert to fraction form
    13,420.08/18,519.84 = 7,830/x
  3. Step 3: Cross multiply
    13,420.08x = 18,519.84 × 7,830
  4. Step 4: Simplify right side
    13,420.08x = 145,010,347.20
  5. Step 5: Solve for x
    x = 145,010,347.20/13,420.08
  6. Step 6: Final answer
    x = 10,805.48

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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.