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Finding the Fourth Proportional to 1,636.47, 2,455.79 and 770.85

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Solution

The fourth proportional to 1,636.47, 2,455.79 and 770.85 is: 1,156.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,636.47 : 2,455.79 = 770.85 : x
  2. Step 2: Convert to fraction form
    1,636.47/2,455.79 = 770.85/x
  3. Step 3: Cross multiply
    1,636.47x = 2,455.79 × 770.85
  4. Step 4: Simplify right side
    1,636.47x = 1,893,045.72
  5. Step 5: Solve for x
    x = 1,893,045.72/1,636.47
  6. Step 6: Final answer
    x = 1,156.79

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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.