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Finding the Fourth Proportional to 858.60, 1,285.20 and 805.14

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Solution

The fourth proportional to 858.60, 1,285.20 and 805.14 is: 1,205.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.60 : 1,285.20 = 805.14 : x
  2. Step 2: Convert to fraction form
    858.60/1,285.20 = 805.14/x
  3. Step 3: Cross multiply
    858.60x = 1,285.20 × 805.14
  4. Step 4: Simplify right side
    858.60x = 1,034,765.93
  5. Step 5: Solve for x
    x = 1,034,765.93/858.60
  6. Step 6: Final answer
    x = 1,205.18

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.