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Finding the Fourth Proportional to 521.45, 719.61 and 300.42

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Solution

The fourth proportional to 521.45, 719.61 and 300.42 is: 414.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.45 : 719.61 = 300.42 : x
  2. Step 2: Convert to fraction form
    521.45/719.61 = 300.42/x
  3. Step 3: Cross multiply
    521.45x = 719.61 × 300.42
  4. Step 4: Simplify right side
    521.45x = 216,185.24
  5. Step 5: Solve for x
    x = 216,185.24/521.45
  6. Step 6: Final answer
    x = 414.58

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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.