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Finding the Fourth Proportional to 851.58, 1,175.43 and 520.20

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Solution

The fourth proportional to 851.58, 1,175.43 and 520.20 is: 718.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.58 : 1,175.43 = 520.20 : x
  2. Step 2: Convert to fraction form
    851.58/1,175.43 = 520.20/x
  3. Step 3: Cross multiply
    851.58x = 1,175.43 × 520.20
  4. Step 4: Simplify right side
    851.58x = 611,458.69
  5. Step 5: Solve for x
    x = 611,458.69/851.58
  6. Step 6: Final answer
    x = 718.03

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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.