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Finding the Fourth Proportional to 456.21, 684.42 and 148.06

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Solution

The fourth proportional to 456.21, 684.42 and 148.06 is: 222.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    456.21 : 684.42 = 148.06 : x
  2. Step 2: Convert to fraction form
    456.21/684.42 = 148.06/x
  3. Step 3: Cross multiply
    456.21x = 684.42 × 148.06
  4. Step 4: Simplify right side
    456.21x = 101,333.51
  5. Step 5: Solve for x
    x = 101,333.51/456.21
  6. Step 6: Final answer
    x = 222.12

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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.