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Finding the Fourth Proportional to 521.67, 719.90 and 300.65

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Solution

The fourth proportional to 521.67, 719.90 and 300.65 is: 414.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.67 : 719.90 = 300.65 : x
  2. Step 2: Convert to fraction form
    521.67/719.90 = 300.65/x
  3. Step 3: Cross multiply
    521.67x = 719.90 × 300.65
  4. Step 4: Simplify right side
    521.67x = 216,432.83
  5. Step 5: Solve for x
    x = 216,432.83/521.67
  6. Step 6: Final answer
    x = 414.88

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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.