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Finding the Fourth Proportional to 875.42, 1,311.80 and 528.37

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Solution

The fourth proportional to 875.42, 1,311.80 and 528.37 is: 791.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.42 : 1,311.80 = 528.37 : x
  2. Step 2: Convert to fraction form
    875.42/1,311.80 = 528.37/x
  3. Step 3: Cross multiply
    875.42x = 1,311.80 × 528.37
  4. Step 4: Simplify right side
    875.42x = 693,109.21
  5. Step 5: Solve for x
    x = 693,109.21/875.42
  6. Step 6: Final answer
    x = 791.75

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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.