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Finding the Fourth Proportional to 315.64, 435.50 and 205

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Solution

The fourth proportional to 315.64, 435.50 and 205 is: 282.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.64 : 435.50 = 205 : x
  2. Step 2: Convert to fraction form
    315.64/435.50 = 205/x
  3. Step 3: Cross multiply
    315.64x = 435.50 × 205
  4. Step 4: Simplify right side
    315.64x = 89,277.50
  5. Step 5: Solve for x
    x = 89,277.50/315.64
  6. Step 6: Final answer
    x = 282.85

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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.