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Finding the Fourth Proportional to 855.20, 1,281.12 and 709.36

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Solution

The fourth proportional to 855.20, 1,281.12 and 709.36 is: 1,062.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.20 : 1,281.12 = 709.36 : x
  2. Step 2: Convert to fraction form
    855.20/1,281.12 = 709.36/x
  3. Step 3: Cross multiply
    855.20x = 1,281.12 × 709.36
  4. Step 4: Simplify right side
    855.20x = 908,775.28
  5. Step 5: Solve for x
    x = 908,775.28/855.20
  6. Step 6: Final answer
    x = 1,062.65

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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.