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Finding the Fourth Proportional to 722.93, 1,085.01 and 312.38

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Solution

The fourth proportional to 722.93, 1,085.01 and 312.38 is: 468.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.93 : 1,085.01 = 312.38 : x
  2. Step 2: Convert to fraction form
    722.93/1,085.01 = 312.38/x
  3. Step 3: Cross multiply
    722.93x = 1,085.01 × 312.38
  4. Step 4: Simplify right side
    722.93x = 338,936.96
  5. Step 5: Solve for x
    x = 338,936.96/722.93
  6. Step 6: Final answer
    x = 468.84

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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.