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Finding the Fourth Proportional to 633.31, 873.51 and 420.50

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Solution

The fourth proportional to 633.31, 873.51 and 420.50 is: 579.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    633.31 : 873.51 = 420.50 : x
  2. Step 2: Convert to fraction form
    633.31/873.51 = 420.50/x
  3. Step 3: Cross multiply
    633.31x = 873.51 × 420.50
  4. Step 4: Simplify right side
    633.31x = 367,310.96
  5. Step 5: Solve for x
    x = 367,310.96/633.31
  6. Step 6: Final answer
    x = 579.99

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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.