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Finding the Fourth Proportional to 740.82, 1,111.90 and 394.45

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Solution

The fourth proportional to 740.82, 1,111.90 and 394.45 is: 592.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.82 : 1,111.90 = 394.45 : x
  2. Step 2: Convert to fraction form
    740.82/1,111.90 = 394.45/x
  3. Step 3: Cross multiply
    740.82x = 1,111.90 × 394.45
  4. Step 4: Simplify right side
    740.82x = 438,583.40
  5. Step 5: Solve for x
    x = 438,583.40/740.82
  6. Step 6: Final answer
    x = 592.02

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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.