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Finding the Fourth Proportional to 814.37, 1,221.87 and 521.87

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Solution

The fourth proportional to 814.37, 1,221.87 and 521.87 is: 783.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    814.37 : 1,221.87 = 521.87 : x
  2. Step 2: Convert to fraction form
    814.37/1,221.87 = 521.87/x
  3. Step 3: Cross multiply
    814.37x = 1,221.87 × 521.87
  4. Step 4: Simplify right side
    814.37x = 637,657.30
  5. Step 5: Solve for x
    x = 637,657.30/814.37
  6. Step 6: Final answer
    x = 783.01

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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.