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Finding the Fourth Proportional to 604.90, 908.20 and 312.60

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Solution

The fourth proportional to 604.90, 908.20 and 312.60 is: 469.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    604.90 : 908.20 = 312.60 : x
  2. Step 2: Convert to fraction form
    604.90/908.20 = 312.60/x
  3. Step 3: Cross multiply
    604.90x = 908.20 × 312.60
  4. Step 4: Simplify right side
    604.90x = 283,903.32
  5. Step 5: Solve for x
    x = 283,903.32/604.90
  6. Step 6: Final answer
    x = 469.34

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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.