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Finding the Fourth Proportional to 685,890.90, 1,028,836.35 and 212,721.30

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Solution

The fourth proportional to 685,890.90, 1,028,836.35 and 212,721.30 is: 319,081.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    685,890.90 : 1,028,836.35 = 212,721.30 : x
  2. Step 2: Convert to fraction form
    685,890.90/1,028,836.35 = 212,721.30/x
  3. Step 3: Cross multiply
    685,890.90x = 1,028,836.35 × 212,721.30
  4. Step 4: Simplify right side
    685,890.90x = 218,855,405,859.26
  5. Step 5: Solve for x
    x = 218,855,405,859.26/685,890.90
  6. Step 6: Final answer
    x = 319,081.95

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Double scale
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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.