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Finding the Fourth Proportional to 421.71, 632.91 and 305.59

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Solution

The fourth proportional to 421.71, 632.91 and 305.59 is: 458.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.71 : 632.91 = 305.59 : x
  2. Step 2: Convert to fraction form
    421.71/632.91 = 305.59/x
  3. Step 3: Cross multiply
    421.71x = 632.91 × 305.59
  4. Step 4: Simplify right side
    421.71x = 193,411.72
  5. Step 5: Solve for x
    x = 193,411.72/421.71
  6. Step 6: Final answer
    x = 458.64

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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.