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Finding the Fourth Proportional to 723.21, 1,085.19 and 357.99

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Solution

The fourth proportional to 723.21, 1,085.19 and 357.99 is: 537.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    723.21 : 1,085.19 = 357.99 : x
  2. Step 2: Convert to fraction form
    723.21/1,085.19 = 357.99/x
  3. Step 3: Cross multiply
    723.21x = 1,085.19 × 357.99
  4. Step 4: Simplify right side
    723.21x = 388,487.17
  5. Step 5: Solve for x
    x = 388,487.17/723.21
  6. Step 6: Final answer
    x = 537.17

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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.