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Finding the Fourth Proportional to 680.72, 1,021.08 and 290.62

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Solution

The fourth proportional to 680.72, 1,021.08 and 290.62 is: 435.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.72 : 1,021.08 = 290.62 : x
  2. Step 2: Convert to fraction form
    680.72/1,021.08 = 290.62/x
  3. Step 3: Cross multiply
    680.72x = 1,021.08 × 290.62
  4. Step 4: Simplify right side
    680.72x = 296,746.27
  5. Step 5: Solve for x
    x = 296,746.27/680.72
  6. Step 6: Final answer
    x = 435.93

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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.