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Finding the Fourth Proportional to 1,259.62, 1,891.18 and 643.75

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Solution

The fourth proportional to 1,259.62, 1,891.18 and 643.75 is: 966.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,259.62 : 1,891.18 = 643.75 : x
  2. Step 2: Convert to fraction form
    1,259.62/1,891.18 = 643.75/x
  3. Step 3: Cross multiply
    1,259.62x = 1,891.18 × 643.75
  4. Step 4: Simplify right side
    1,259.62x = 1,217,443.20
  5. Step 5: Solve for x
    x = 1,217,443.20/1,259.62
  6. Step 6: Final answer
    x = 966.52

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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.