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Finding the Fourth Proportional to 493.76, 740.32 and 421.76

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Solution

The fourth proportional to 493.76, 740.32 and 421.76 is: 632.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    493.76 : 740.32 = 421.76 : x
  2. Step 2: Convert to fraction form
    493.76/740.32 = 421.76/x
  3. Step 3: Cross multiply
    493.76x = 740.32 × 421.76
  4. Step 4: Simplify right side
    493.76x = 312,237.36
  5. Step 5: Solve for x
    x = 312,237.36/493.76
  6. Step 6: Final answer
    x = 632.37

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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.