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Finding the Fourth Proportional to 438.28, 656.76 and 389.38

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Solution

The fourth proportional to 438.28, 656.76 and 389.38 is: 583.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.28 : 656.76 = 389.38 : x
  2. Step 2: Convert to fraction form
    438.28/656.76 = 389.38/x
  3. Step 3: Cross multiply
    438.28x = 656.76 × 389.38
  4. Step 4: Simplify right side
    438.28x = 255,729.21
  5. Step 5: Solve for x
    x = 255,729.21/438.28
  6. Step 6: Final answer
    x = 583.48

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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.