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Finding the Fourth Proportional to 746.56, 1,118.76 and 421.48

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Solution

The fourth proportional to 746.56, 1,118.76 and 421.48 is: 631.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    746.56 : 1,118.76 = 421.48 : x
  2. Step 2: Convert to fraction form
    746.56/1,118.76 = 421.48/x
  3. Step 3: Cross multiply
    746.56x = 1,118.76 × 421.48
  4. Step 4: Simplify right side
    746.56x = 471,534.96
  5. Step 5: Solve for x
    x = 471,534.96/746.56
  6. Step 6: Final answer
    x = 631.61

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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.