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Finding the Fourth Proportional to 438.05, 604.70 and 313.49

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Solution

The fourth proportional to 438.05, 604.70 and 313.49 is: 432.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.05 : 604.70 = 313.49 : x
  2. Step 2: Convert to fraction form
    438.05/604.70 = 313.49/x
  3. Step 3: Cross multiply
    438.05x = 604.70 × 313.49
  4. Step 4: Simplify right side
    438.05x = 189,562.81
  5. Step 5: Solve for x
    x = 189,562.81/438.05
  6. Step 6: Final answer
    x = 432.75

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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.