Home / 20,666.40-30,999.60-13,279.20

Finding the Fourth Proportional to 20,666.40, 30,999.60 and 13,279.20

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Solution

The fourth proportional to 20,666.40, 30,999.60 and 13,279.20 is: 19,918.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,666.40 : 30,999.60 = 13,279.20 : x
  2. Step 2: Convert to fraction form
    20,666.40/30,999.60 = 13,279.20/x
  3. Step 3: Cross multiply
    20,666.40x = 30,999.60 × 13,279.20
  4. Step 4: Simplify right side
    20,666.40x = 411,649,888.32
  5. Step 5: Solve for x
    x = 411,649,888.32/20,666.40
  6. Step 6: Final answer
    x = 19,918.80

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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.