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Finding the Fourth Proportional to 1,259.60, 1,886.36 and 641.68

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Solution

The fourth proportional to 1,259.60, 1,886.36 and 641.68 is: 960.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,259.60 : 1,886.36 = 641.68 : x
  2. Step 2: Convert to fraction form
    1,259.60/1,886.36 = 641.68/x
  3. Step 3: Cross multiply
    1,259.60x = 1,886.36 × 641.68
  4. Step 4: Simplify right side
    1,259.60x = 1,210,439.48
  5. Step 5: Solve for x
    x = 1,210,439.48/1,259.60
  6. Step 6: Final answer
    x = 960.97

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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.