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Finding the Fourth Proportional to 438.26, 657.22 and 145.70

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Solution

The fourth proportional to 438.26, 657.22 and 145.70 is: 218.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.26 : 657.22 = 145.70 : x
  2. Step 2: Convert to fraction form
    438.26/657.22 = 145.70/x
  3. Step 3: Cross multiply
    438.26x = 657.22 × 145.70
  4. Step 4: Simplify right side
    438.26x = 95,758.60
  5. Step 5: Solve for x
    x = 95,758.60/438.26
  6. Step 6: Final answer
    x = 218.50

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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.