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Finding the Fourth Proportional to 851.66, 1,175.67 and 520.21

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Solution

The fourth proportional to 851.66, 1,175.67 and 520.21 is: 718.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.66 : 1,175.67 = 520.21 : x
  2. Step 2: Convert to fraction form
    851.66/1,175.67 = 520.21/x
  3. Step 3: Cross multiply
    851.66x = 1,175.67 × 520.21
  4. Step 4: Simplify right side
    851.66x = 611,586.81
  5. Step 5: Solve for x
    x = 611,586.81/851.66
  6. Step 6: Final answer
    x = 718.12

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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.