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Finding the Fourth Proportional to 315.66, 435.11 and 253.38

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Solution

The fourth proportional to 315.66, 435.11 and 253.38 is: 349.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.66 : 435.11 = 253.38 : x
  2. Step 2: Convert to fraction form
    315.66/435.11 = 253.38/x
  3. Step 3: Cross multiply
    315.66x = 435.11 × 253.38
  4. Step 4: Simplify right side
    315.66x = 110,248.17
  5. Step 5: Solve for x
    x = 110,248.17/315.66
  6. Step 6: Final answer
    x = 349.26

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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.