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Finding the Fourth Proportional to 315.81, 435.71 and 177.81

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Solution

The fourth proportional to 315.81, 435.71 and 177.81 is: 245.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.81 : 435.71 = 177.81 : x
  2. Step 2: Convert to fraction form
    315.81/435.71 = 177.81/x
  3. Step 3: Cross multiply
    315.81x = 435.71 × 177.81
  4. Step 4: Simplify right side
    315.81x = 77,472.71
  5. Step 5: Solve for x
    x = 77,472.71/315.81
  6. Step 6: Final answer
    x = 245.31

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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.