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Finding the Fourth Proportional to 208.81, 313.28 and 148.06

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Solution

The fourth proportional to 208.81, 313.28 and 148.06 is: 222.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.81 : 313.28 = 148.06 : x
  2. Step 2: Convert to fraction form
    208.81/313.28 = 148.06/x
  3. Step 3: Cross multiply
    208.81x = 313.28 × 148.06
  4. Step 4: Simplify right side
    208.81x = 46,384.24
  5. Step 5: Solve for x
    x = 46,384.24/208.81
  6. Step 6: Final answer
    x = 222.14

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.