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Finding the Fourth Proportional to 421.37, 631.19 and 247.51

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Solution

The fourth proportional to 421.37, 631.19 and 247.51 is: 370.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.37 : 631.19 = 247.51 : x
  2. Step 2: Convert to fraction form
    421.37/631.19 = 247.51/x
  3. Step 3: Cross multiply
    421.37x = 631.19 × 247.51
  4. Step 4: Simplify right side
    421.37x = 156,223.02
  5. Step 5: Solve for x
    x = 156,223.02/421.37
  6. Step 6: Final answer
    x = 370.75

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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.