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Finding the Fourth Proportional to 438.08, 604.64 and 306.72

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Solution

The fourth proportional to 438.08, 604.64 and 306.72 is: 423.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.08 : 604.64 = 306.72 : x
  2. Step 2: Convert to fraction form
    438.08/604.64 = 306.72/x
  3. Step 3: Cross multiply
    438.08x = 604.64 × 306.72
  4. Step 4: Simplify right side
    438.08x = 185,455.18
  5. Step 5: Solve for x
    x = 185,455.18/438.08
  6. Step 6: Final answer
    x = 423.34

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.