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Finding the Fourth Proportional to 315.64, 435.72 and 199.36

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Solution

The fourth proportional to 315.64, 435.72 and 199.36 is: 275.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.64 : 435.72 = 199.36 : x
  2. Step 2: Convert to fraction form
    315.64/435.72 = 199.36/x
  3. Step 3: Cross multiply
    315.64x = 435.72 × 199.36
  4. Step 4: Simplify right side
    315.64x = 86,865.14
  5. Step 5: Solve for x
    x = 86,865.14/315.64
  6. Step 6: Final answer
    x = 275.20

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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.