Home / 20,679.84-31,001.76-13,286.40

Finding the Fourth Proportional to 20,679.84, 31,001.76 and 13,286.40

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Solution

The fourth proportional to 20,679.84, 31,001.76 and 13,286.40 is: 19,918.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,679.84 : 31,001.76 = 13,286.40 : x
  2. Step 2: Convert to fraction form
    20,679.84/31,001.76 = 13,286.40/x
  3. Step 3: Cross multiply
    20,679.84x = 31,001.76 × 13,286.40
  4. Step 4: Simplify right side
    20,679.84x = 411,901,784.06
  5. Step 5: Solve for x
    x = 411,901,784.06/20,679.84
  6. Step 6: Final answer
    x = 19,918.04

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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.