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Finding the Fourth Proportional to 855.60, 1,282.05 and 717.90

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Solution

The fourth proportional to 855.60, 1,282.05 and 717.90 is: 1,075.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.60 : 1,282.05 = 717.90 : x
  2. Step 2: Convert to fraction form
    855.60/1,282.05 = 717.90/x
  3. Step 3: Cross multiply
    855.60x = 1,282.05 × 717.90
  4. Step 4: Simplify right side
    855.60x = 920,383.70
  5. Step 5: Solve for x
    x = 920,383.70/855.60
  6. Step 6: Final answer
    x = 1,075.72

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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.