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Finding the Fourth Proportional to 722.15, 1,081.60 and 356.13

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Solution

The fourth proportional to 722.15, 1,081.60 and 356.13 is: 533.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.15 : 1,081.60 = 356.13 : x
  2. Step 2: Convert to fraction form
    722.15/1,081.60 = 356.13/x
  3. Step 3: Cross multiply
    722.15x = 1,081.60 × 356.13
  4. Step 4: Simplify right side
    722.15x = 385,189.32
  5. Step 5: Solve for x
    x = 385,189.32/722.15
  6. Step 6: Final answer
    x = 533.39

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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.