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Finding the Fourth Proportional to 320.08, 438.02 and 313.36

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Solution

The fourth proportional to 320.08, 438.02 and 313.36 is: 428.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.08 : 438.02 = 313.36 : x
  2. Step 2: Convert to fraction form
    320.08/438.02 = 313.36/x
  3. Step 3: Cross multiply
    320.08x = 438.02 × 313.36
  4. Step 4: Simplify right side
    320.08x = 137,257.95
  5. Step 5: Solve for x
    x = 137,257.95/320.08
  6. Step 6: Final answer
    x = 428.82

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.