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Finding the Fourth Proportional to 1,261.45, 1,893.32 and 645.58

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Solution

The fourth proportional to 1,261.45, 1,893.32 and 645.58 is: 968.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.45 : 1,893.32 = 645.58 : x
  2. Step 2: Convert to fraction form
    1,261.45/1,893.32 = 645.58/x
  3. Step 3: Cross multiply
    1,261.45x = 1,893.32 × 645.58
  4. Step 4: Simplify right side
    1,261.45x = 1,222,276.83
  5. Step 5: Solve for x
    x = 1,222,276.83/1,261.45
  6. Step 6: Final answer
    x = 968.95

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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.