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Finding the Fourth Proportional to 521.76, 719.49 and 451.78

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Solution

The fourth proportional to 521.76, 719.49 and 451.78 is: 622.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.76 : 719.49 = 451.78 : x
  2. Step 2: Convert to fraction form
    521.76/719.49 = 451.78/x
  3. Step 3: Cross multiply
    521.76x = 719.49 × 451.78
  4. Step 4: Simplify right side
    521.76x = 325,051.19
  5. Step 5: Solve for x
    x = 325,051.19/521.76
  6. Step 6: Final answer
    x = 622.99

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.