Home / 20,289.80-30,434.70-13,291.40

Finding the Fourth Proportional to 20,289.80, 30,434.70 and 13,291.40

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Solution

The fourth proportional to 20,289.80, 30,434.70 and 13,291.40 is: 19,937.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,289.80 : 30,434.70 = 13,291.40 : x
  2. Step 2: Convert to fraction form
    20,289.80/30,434.70 = 13,291.40/x
  3. Step 3: Cross multiply
    20,289.80x = 30,434.70 × 13,291.40
  4. Step 4: Simplify right side
    20,289.80x = 404,519,771.58
  5. Step 5: Solve for x
    x = 404,519,771.58/20,289.80
  6. Step 6: Final answer
    x = 19,937.10

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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.