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Finding the Fourth Proportional to 1,257.45, 1,887.03 and 641.57

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Solution

The fourth proportional to 1,257.45, 1,887.03 and 641.57 is: 962.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,257.45 : 1,887.03 = 641.57 : x
  2. Step 2: Convert to fraction form
    1,257.45/1,887.03 = 641.57/x
  3. Step 3: Cross multiply
    1,257.45x = 1,887.03 × 641.57
  4. Step 4: Simplify right side
    1,257.45x = 1,210,661.84
  5. Step 5: Solve for x
    x = 1,210,661.84/1,257.45
  6. Step 6: Final answer
    x = 962.80

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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.