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Finding the Fourth Proportional to 421.53, 632.03 and 128.93

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Solution

The fourth proportional to 421.53, 632.03 and 128.93 is: 193.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.53 : 632.03 = 128.93 : x
  2. Step 2: Convert to fraction form
    421.53/632.03 = 128.93/x
  3. Step 3: Cross multiply
    421.53x = 632.03 × 128.93
  4. Step 4: Simplify right side
    421.53x = 81,489.29
  5. Step 5: Solve for x
    x = 81,489.29/421.53
  6. Step 6: Final answer
    x = 193.32

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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.