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Finding the Fourth Proportional to 874.21, 1,308.99 and 527.05

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Solution

The fourth proportional to 874.21, 1,308.99 and 527.05 is: 789.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.21 : 1,308.99 = 527.05 : x
  2. Step 2: Convert to fraction form
    874.21/1,308.99 = 527.05/x
  3. Step 3: Cross multiply
    874.21x = 1,308.99 × 527.05
  4. Step 4: Simplify right side
    874.21x = 689,903.18
  5. Step 5: Solve for x
    x = 689,903.18/874.21
  6. Step 6: Final answer
    x = 789.17

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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.