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Finding the Fourth Proportional to 851.58, 1,175.28 and 519.99

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Solution

The fourth proportional to 851.58, 1,175.28 and 519.99 is: 717.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.58 : 1,175.28 = 519.99 : x
  2. Step 2: Convert to fraction form
    851.58/1,175.28 = 519.99/x
  3. Step 3: Cross multiply
    851.58x = 1,175.28 × 519.99
  4. Step 4: Simplify right side
    851.58x = 611,133.85
  5. Step 5: Solve for x
    x = 611,133.85/851.58
  6. Step 6: Final answer
    x = 717.65

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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.