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Finding the Fourth Proportional to 315.40, 435.09 and 257.08

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Solution

The fourth proportional to 315.40, 435.09 and 257.08 is: 354.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.40 : 435.09 = 257.08 : x
  2. Step 2: Convert to fraction form
    315.40/435.09 = 257.08/x
  3. Step 3: Cross multiply
    315.40x = 435.09 × 257.08
  4. Step 4: Simplify right side
    315.40x = 111,852.94
  5. Step 5: Solve for x
    x = 111,852.94/315.40
  6. Step 6: Final answer
    x = 354.64

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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.