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Finding the Fourth Proportional to 680.09, 1,018.08 and 436.79

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Solution

The fourth proportional to 680.09, 1,018.08 and 436.79 is: 653.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.09 : 1,018.08 = 436.79 : x
  2. Step 2: Convert to fraction form
    680.09/1,018.08 = 436.79/x
  3. Step 3: Cross multiply
    680.09x = 1,018.08 × 436.79
  4. Step 4: Simplify right side
    680.09x = 444,689.71
  5. Step 5: Solve for x
    x = 444,689.71/680.09
  6. Step 6: Final answer
    x = 653.87

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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.