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Finding the Fourth Proportional to 315.21, 434.08 and 270.59

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Solution

The fourth proportional to 315.21, 434.08 and 270.59 is: 372.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.21 : 434.08 = 270.59 : x
  2. Step 2: Convert to fraction form
    315.21/434.08 = 270.59/x
  3. Step 3: Cross multiply
    315.21x = 434.08 × 270.59
  4. Step 4: Simplify right side
    315.21x = 117,457.71
  5. Step 5: Solve for x
    x = 117,457.71/315.21
  6. Step 6: Final answer
    x = 372.63

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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.