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Finding the Fourth Proportional to 421.55, 632.29 and 113.39

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Solution

The fourth proportional to 421.55, 632.29 and 113.39 is: 170.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.55 : 632.29 = 113.39 : x
  2. Step 2: Convert to fraction form
    421.55/632.29 = 113.39/x
  3. Step 3: Cross multiply
    421.55x = 632.29 × 113.39
  4. Step 4: Simplify right side
    421.55x = 71,696.66
  5. Step 5: Solve for x
    x = 71,696.66/421.55
  6. Step 6: Final answer
    x = 170.08

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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.