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Finding the Fourth Proportional to 859.13, 1,281.15 and 851.34

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Solution

The fourth proportional to 859.13, 1,281.15 and 851.34 is: 1,269.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.13 : 1,281.15 = 851.34 : x
  2. Step 2: Convert to fraction form
    859.13/1,281.15 = 851.34/x
  3. Step 3: Cross multiply
    859.13x = 1,281.15 × 851.34
  4. Step 4: Simplify right side
    859.13x = 1,090,694.24
  5. Step 5: Solve for x
    x = 1,090,694.24/859.13
  6. Step 6: Final answer
    x = 1,269.53

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.