Home / 19,999.90-29,999.85-13,779.10

Finding the Fourth Proportional to 19,999.90, 29,999.85 and 13,779.10

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Solution

The fourth proportional to 19,999.90, 29,999.85 and 13,779.10 is: 20,668.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,999.90 : 29,999.85 = 13,779.10 : x
  2. Step 2: Convert to fraction form
    19,999.90/29,999.85 = 13,779.10/x
  3. Step 3: Cross multiply
    19,999.90x = 29,999.85 × 13,779.10
  4. Step 4: Simplify right side
    19,999.90x = 413,370,933.14
  5. Step 5: Solve for x
    x = 413,370,933.14/19,999.90
  6. Step 6: Final answer
    x = 20,668.65

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Similar ratio
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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.