Home / 20,699.75-30,890.55-18,485.30

Finding the Fourth Proportional to 20,699.75, 30,890.55 and 18,485.30

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Solution

The fourth proportional to 20,699.75, 30,890.55 and 18,485.30 is: 27,585.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,699.75 : 30,890.55 = 18,485.30 : x
  2. Step 2: Convert to fraction form
    20,699.75/30,890.55 = 18,485.30/x
  3. Step 3: Cross multiply
    20,699.75x = 30,890.55 × 18,485.30
  4. Step 4: Simplify right side
    20,699.75x = 571,021,083.92
  5. Step 5: Solve for x
    x = 571,021,083.92/20,699.75
  6. Step 6: Final answer
    x = 27,585.89

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.