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Finding the Fourth Proportional to 1,772.64, 2,658.96 and 860

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Solution

The fourth proportional to 1,772.64, 2,658.96 and 860 is: 1,290

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,772.64 : 2,658.96 = 860 : x
  2. Step 2: Convert to fraction form
    1,772.64/2,658.96 = 860/x
  3. Step 3: Cross multiply
    1,772.64x = 2,658.96 × 860
  4. Step 4: Simplify right side
    1,772.64x = 2,286,705.60
  5. Step 5: Solve for x
    x = 2,286,705.60/1,772.64
  6. Step 6: Final answer
    x = 1,290

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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.