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Finding the Fourth Proportional to 521.18, 782.05 and 289.94

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Solution

The fourth proportional to 521.18, 782.05 and 289.94 is: 435.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.18 : 782.05 = 289.94 : x
  2. Step 2: Convert to fraction form
    521.18/782.05 = 289.94/x
  3. Step 3: Cross multiply
    521.18x = 782.05 × 289.94
  4. Step 4: Simplify right side
    521.18x = 226,742.94
  5. Step 5: Solve for x
    x = 226,742.94/521.18
  6. Step 6: Final answer
    x = 435.06

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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.