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Finding the Fourth Proportional to 1,245.39, 1,866.90 and 464.87

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Solution

The fourth proportional to 1,245.39, 1,866.90 and 464.87 is: 696.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.39 : 1,866.90 = 464.87 : x
  2. Step 2: Convert to fraction form
    1,245.39/1,866.90 = 464.87/x
  3. Step 3: Cross multiply
    1,245.39x = 1,866.90 × 464.87
  4. Step 4: Simplify right side
    1,245.39x = 867,856.47
  5. Step 5: Solve for x
    x = 867,856.47/1,245.39
  6. Step 6: Final answer
    x = 696.86

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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.