Home / 20,982.60-31,425.30-13,109.40

Finding the Fourth Proportional to 20,982.60, 31,425.30 and 13,109.40

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Solution

The fourth proportional to 20,982.60, 31,425.30 and 13,109.40 is: 19,633.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,982.60 : 31,425.30 = 13,109.40 : x
  2. Step 2: Convert to fraction form
    20,982.60/31,425.30 = 13,109.40/x
  3. Step 3: Cross multiply
    20,982.60x = 31,425.30 × 13,109.40
  4. Step 4: Simplify right side
    20,982.60x = 411,966,827.82
  5. Step 5: Solve for x
    x = 411,966,827.82/20,982.60
  6. Step 6: Final answer
    x = 19,633.74

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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.