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Finding the Fourth Proportional to 851.95, 1,175.31 and 520.32

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Solution

The fourth proportional to 851.95, 1,175.31 and 520.32 is: 717.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.95 : 1,175.31 = 520.32 : x
  2. Step 2: Convert to fraction form
    851.95/1,175.31 = 520.32/x
  3. Step 3: Cross multiply
    851.95x = 1,175.31 × 520.32
  4. Step 4: Simplify right side
    851.95x = 611,531.79
  5. Step 5: Solve for x
    x = 611,531.79/851.95
  6. Step 6: Final answer
    x = 717.80

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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.