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Finding the Fourth Proportional to 313.30, 439.70 and 313.30

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Solution

The fourth proportional to 313.30, 439.70 and 313.30 is: 439.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.30 : 439.70 = 313.30 : x
  2. Step 2: Convert to fraction form
    313.30/439.70 = 313.30/x
  3. Step 3: Cross multiply
    313.30x = 439.70 × 313.30
  4. Step 4: Simplify right side
    313.30x = 137,758.01
  5. Step 5: Solve for x
    x = 137,758.01/313.30
  6. Step 6: Final answer
    x = 439.70

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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.