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Finding the Fourth Proportional to 421.25, 631.95 and 147.51

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Solution

The fourth proportional to 421.25, 631.95 and 147.51 is: 221.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.25 : 631.95 = 147.51 : x
  2. Step 2: Convert to fraction form
    421.25/631.95 = 147.51/x
  3. Step 3: Cross multiply
    421.25x = 631.95 × 147.51
  4. Step 4: Simplify right side
    421.25x = 93,218.94
  5. Step 5: Solve for x
    x = 93,218.94/421.25
  6. Step 6: Final answer
    x = 221.29

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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.