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Finding the Fourth Proportional to 873.72, 1,205.64 and 519.48

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Solution

The fourth proportional to 873.72, 1,205.64 and 519.48 is: 716.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.72 : 1,205.64 = 519.48 : x
  2. Step 2: Convert to fraction form
    873.72/1,205.64 = 519.48/x
  3. Step 3: Cross multiply
    873.72x = 1,205.64 × 519.48
  4. Step 4: Simplify right side
    873.72x = 626,305.87
  5. Step 5: Solve for x
    x = 626,305.87/873.72
  6. Step 6: Final answer
    x = 716.83

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.