Home / 20,758.86-28,678.44-13,605.75

Finding the Fourth Proportional to 20,758.86, 28,678.44 and 13,605.75

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Solution

The fourth proportional to 20,758.86, 28,678.44 and 13,605.75 is: 18,796.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,758.86 : 28,678.44 = 13,605.75 : x
  2. Step 2: Convert to fraction form
    20,758.86/28,678.44 = 13,605.75/x
  3. Step 3: Cross multiply
    20,758.86x = 28,678.44 × 13,605.75
  4. Step 4: Simplify right side
    20,758.86x = 390,191,685.03
  5. Step 5: Solve for x
    x = 390,191,685.03/20,758.86
  6. Step 6: Final answer
    x = 18,796.39

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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.