Home / 18,990.72-28,420.47-13,122.27

Finding the Fourth Proportional to 18,990.72, 28,420.47 and 13,122.27

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Solution

The fourth proportional to 18,990.72, 28,420.47 and 13,122.27 is: 19,638.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,990.72 : 28,420.47 = 13,122.27 : x
  2. Step 2: Convert to fraction form
    18,990.72/28,420.47 = 13,122.27/x
  3. Step 3: Cross multiply
    18,990.72x = 28,420.47 × 13,122.27
  4. Step 4: Simplify right side
    18,990.72x = 372,941,080.87
  5. Step 5: Solve for x
    x = 372,941,080.87/18,990.72
  6. Step 6: Final answer
    x = 19,638.07

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1.5x scale

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.