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Finding the Fourth Proportional to 454.40, 681.76 and 421.76

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Solution

The fourth proportional to 454.40, 681.76 and 421.76 is: 632.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    454.40 : 681.76 = 421.76 : x
  2. Step 2: Convert to fraction form
    454.40/681.76 = 421.76/x
  3. Step 3: Cross multiply
    454.40x = 681.76 × 421.76
  4. Step 4: Simplify right side
    454.40x = 287,539.10
  5. Step 5: Solve for x
    x = 287,539.10/454.40
  6. Step 6: Final answer
    x = 632.79

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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.