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Finding the Fourth Proportional to 755.06, 1,132.78 and 408.40

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Solution

The fourth proportional to 755.06, 1,132.78 and 408.40 is: 612.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.06 : 1,132.78 = 408.40 : x
  2. Step 2: Convert to fraction form
    755.06/1,132.78 = 408.40/x
  3. Step 3: Cross multiply
    755.06x = 1,132.78 × 408.40
  4. Step 4: Simplify right side
    755.06x = 462,623.50
  5. Step 5: Solve for x
    x = 462,623.50/755.06
  6. Step 6: Final answer
    x = 612.70

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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.