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Finding the Fourth Proportional to 315.18, 435.24 and 287.64

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Solution

The fourth proportional to 315.18, 435.24 and 287.64 is: 397.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.18 : 435.24 = 287.64 : x
  2. Step 2: Convert to fraction form
    315.18/435.24 = 287.64/x
  3. Step 3: Cross multiply
    315.18x = 435.24 × 287.64
  4. Step 4: Simplify right side
    315.18x = 125,192.43
  5. Step 5: Solve for x
    x = 125,192.43/315.18
  6. Step 6: Final answer
    x = 397.21

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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.