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Finding the Fourth Proportional to 680.47, 1,020.26 and 356.07

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Solution

The fourth proportional to 680.47, 1,020.26 and 356.07 is: 533.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.47 : 1,020.26 = 356.07 : x
  2. Step 2: Convert to fraction form
    680.47/1,020.26 = 356.07/x
  3. Step 3: Cross multiply
    680.47x = 1,020.26 × 356.07
  4. Step 4: Simplify right side
    680.47x = 363,277.10
  5. Step 5: Solve for x
    x = 363,277.10/680.47
  6. Step 6: Final answer
    x = 533.86

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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.