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Finding the Fourth Proportional to 866.21, 1,299.51 and 624.56

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Solution

The fourth proportional to 866.21, 1,299.51 and 624.56 is: 936.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    866.21 : 1,299.51 = 624.56 : x
  2. Step 2: Convert to fraction form
    866.21/1,299.51 = 624.56/x
  3. Step 3: Cross multiply
    866.21x = 1,299.51 × 624.56
  4. Step 4: Simplify right side
    866.21x = 811,615.47
  5. Step 5: Solve for x
    x = 811,615.47/866.21
  6. Step 6: Final answer
    x = 936.98

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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.