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Finding the Fourth Proportional to 869.58, 1,302.08 and 609.90

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Solution

The fourth proportional to 869.58, 1,302.08 and 609.90 is: 913.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.58 : 1,302.08 = 609.90 : x
  2. Step 2: Convert to fraction form
    869.58/1,302.08 = 609.90/x
  3. Step 3: Cross multiply
    869.58x = 1,302.08 × 609.90
  4. Step 4: Simplify right side
    869.58x = 794,135.54
  5. Step 5: Solve for x
    x = 794,135.54/869.58
  6. Step 6: Final answer
    x = 913.24

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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.