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Finding the Fourth Proportional to 680.44, 1,020.70 and 355.40

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Solution

The fourth proportional to 680.44, 1,020.70 and 355.40 is: 533.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.44 : 1,020.70 = 355.40 : x
  2. Step 2: Convert to fraction form
    680.44/1,020.70 = 355.40/x
  3. Step 3: Cross multiply
    680.44x = 1,020.70 × 355.40
  4. Step 4: Simplify right side
    680.44x = 362,756.78
  5. Step 5: Solve for x
    x = 362,756.78/680.44
  6. Step 6: Final answer
    x = 533.12

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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.