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Finding the Fourth Proportional to 521.60, 720.72 and 411.96

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Solution

The fourth proportional to 521.60, 720.72 and 411.96 is: 569.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.60 : 720.72 = 411.96 : x
  2. Step 2: Convert to fraction form
    521.60/720.72 = 411.96/x
  3. Step 3: Cross multiply
    521.60x = 720.72 × 411.96
  4. Step 4: Simplify right side
    521.60x = 296,907.81
  5. Step 5: Solve for x
    x = 296,907.81/521.60
  6. Step 6: Final answer
    x = 569.23

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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.