Home / 13,420.47-18,519.90-7,451.99

Finding the Fourth Proportional to 13,420.47, 18,519.90 and 7,451.99

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Solution

The fourth proportional to 13,420.47, 18,519.90 and 7,451.99 is: 10,283.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,420.47 : 18,519.90 = 7,451.99 : x
  2. Step 2: Convert to fraction form
    13,420.47/18,519.90 = 7,451.99/x
  3. Step 3: Cross multiply
    13,420.47x = 18,519.90 × 7,451.99
  4. Step 4: Simplify right side
    13,420.47x = 138,009,989.06
  5. Step 5: Solve for x
    x = 138,009,989.06/13,420.47
  6. Step 6: Final answer
    x = 10,283.54

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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.