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Finding the Fourth Proportional to 315.60, 435.40 and 199.28

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Solution

The fourth proportional to 315.60, 435.40 and 199.28 is: 274.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.60 : 435.40 = 199.28 : x
  2. Step 2: Convert to fraction form
    315.60/435.40 = 199.28/x
  3. Step 3: Cross multiply
    315.60x = 435.40 × 199.28
  4. Step 4: Simplify right side
    315.60x = 86,766.51
  5. Step 5: Solve for x
    x = 86,766.51/315.60
  6. Step 6: Final answer
    x = 274.93

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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.