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Finding the Fourth Proportional to 1,260.14, 1,890.90 and 643.95

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Solution

The fourth proportional to 1,260.14, 1,890.90 and 643.95 is: 966.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,260.14 : 1,890.90 = 643.95 : x
  2. Step 2: Convert to fraction form
    1,260.14/1,890.90 = 643.95/x
  3. Step 3: Cross multiply
    1,260.14x = 1,890.90 × 643.95
  4. Step 4: Simplify right side
    1,260.14x = 1,217,645.06
  5. Step 5: Solve for x
    x = 1,217,645.06/1,260.14
  6. Step 6: Final answer
    x = 966.28

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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.