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Finding the Fourth Proportional to 680.06, 1,020.36 and 391.34

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Solution

The fourth proportional to 680.06, 1,020.36 and 391.34 is: 587.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.06 : 1,020.36 = 391.34 : x
  2. Step 2: Convert to fraction form
    680.06/1,020.36 = 391.34/x
  3. Step 3: Cross multiply
    680.06x = 1,020.36 × 391.34
  4. Step 4: Simplify right side
    680.06x = 399,307.68
  5. Step 5: Solve for x
    x = 399,307.68/680.06
  6. Step 6: Final answer
    x = 587.17

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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.