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Finding the Fourth Proportional to 851.51, 1,175.31 and 520.12

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Solution

The fourth proportional to 851.51, 1,175.31 and 520.12 is: 717.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.51 : 1,175.31 = 520.12 : x
  2. Step 2: Convert to fraction form
    851.51/1,175.31 = 520.12/x
  3. Step 3: Cross multiply
    851.51x = 1,175.31 × 520.12
  4. Step 4: Simplify right side
    851.51x = 611,303.71
  5. Step 5: Solve for x
    x = 611,303.71/851.51
  6. Step 6: Final answer
    x = 717.90

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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.