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Finding the Fourth Proportional to 313.80, 434.04 and 279.36

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Solution

The fourth proportional to 313.80, 434.04 and 279.36 is: 386.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.80 : 434.04 = 279.36 : x
  2. Step 2: Convert to fraction form
    313.80/434.04 = 279.36/x
  3. Step 3: Cross multiply
    313.80x = 434.04 × 279.36
  4. Step 4: Simplify right side
    313.80x = 121,253.41
  5. Step 5: Solve for x
    x = 121,253.41/313.80
  6. Step 6: Final answer
    x = 386.40

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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.