Home / 18,686.72-25,771.80-15,790.47

Finding the Fourth Proportional to 18,686.72, 25,771.80 and 15,790.47

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Solution

The fourth proportional to 18,686.72, 25,771.80 and 15,790.47 is: 21,777.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,686.72 : 25,771.80 = 15,790.47 : x
  2. Step 2: Convert to fraction form
    18,686.72/25,771.80 = 15,790.47/x
  3. Step 3: Cross multiply
    18,686.72x = 25,771.80 × 15,790.47
  4. Step 4: Simplify right side
    18,686.72x = 406,948,834.75
  5. Step 5: Solve for x
    x = 406,948,834.75/18,686.72
  6. Step 6: Final answer
    x = 21,777.44

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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.