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Finding the Fourth Proportional to 1,152.69, 1,729.26 and 459.21

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Solution

The fourth proportional to 1,152.69, 1,729.26 and 459.21 is: 688.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,152.69 : 1,729.26 = 459.21 : x
  2. Step 2: Convert to fraction form
    1,152.69/1,729.26 = 459.21/x
  3. Step 3: Cross multiply
    1,152.69x = 1,729.26 × 459.21
  4. Step 4: Simplify right side
    1,152.69x = 794,093.48
  5. Step 5: Solve for x
    x = 794,093.48/1,152.69
  6. Step 6: Final answer
    x = 688.90

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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.