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Finding the Fourth Proportional to 745.94, 1,118.91 and 438.02

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Solution

The fourth proportional to 745.94, 1,118.91 and 438.02 is: 657.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.94 : 1,118.91 = 438.02 : x
  2. Step 2: Convert to fraction form
    745.94/1,118.91 = 438.02/x
  3. Step 3: Cross multiply
    745.94x = 1,118.91 × 438.02
  4. Step 4: Simplify right side
    745.94x = 490,104.96
  5. Step 5: Solve for x
    x = 490,104.96/745.94
  6. Step 6: Final answer
    x = 657.03

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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.