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Finding the Fourth Proportional to 421.54, 632.08 and 143.81

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Solution

The fourth proportional to 421.54, 632.08 and 143.81 is: 215.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.54 : 632.08 = 143.81 : x
  2. Step 2: Convert to fraction form
    421.54/632.08 = 143.81/x
  3. Step 3: Cross multiply
    421.54x = 632.08 × 143.81
  4. Step 4: Simplify right side
    421.54x = 90,899.42
  5. Step 5: Solve for x
    x = 90,899.42/421.54
  6. Step 6: Final answer
    x = 215.64

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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.