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Finding the Fourth Proportional to 851.69, 1,175.30 and 520.67

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Solution

The fourth proportional to 851.69, 1,175.30 and 520.67 is: 718.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.69 : 1,175.30 = 520.67 : x
  2. Step 2: Convert to fraction form
    851.69/1,175.30 = 520.67/x
  3. Step 3: Cross multiply
    851.69x = 1,175.30 × 520.67
  4. Step 4: Simplify right side
    851.69x = 611,940.85
  5. Step 5: Solve for x
    x = 611,940.85/851.69
  6. Step 6: Final answer
    x = 718.50

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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.