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Finding the Fourth Proportional to 314.20, 438.80 and 314.20

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Solution

The fourth proportional to 314.20, 438.80 and 314.20 is: 438.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    314.20 : 438.80 = 314.20 : x
  2. Step 2: Convert to fraction form
    314.20/438.80 = 314.20/x
  3. Step 3: Cross multiply
    314.20x = 438.80 × 314.20
  4. Step 4: Simplify right side
    314.20x = 137,870.96
  5. Step 5: Solve for x
    x = 137,870.96/314.20
  6. Step 6: Final answer
    x = 438.80

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.