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Finding the Fourth Proportional to 1,257.54, 1,885.06 and 641.53

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Solution

The fourth proportional to 1,257.54, 1,885.06 and 641.53 is: 961.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,257.54 : 1,885.06 = 641.53 : x
  2. Step 2: Convert to fraction form
    1,257.54/1,885.06 = 641.53/x
  3. Step 3: Cross multiply
    1,257.54x = 1,885.06 × 641.53
  4. Step 4: Simplify right side
    1,257.54x = 1,209,322.54
  5. Step 5: Solve for x
    x = 1,209,322.54/1,257.54
  6. Step 6: Final answer
    x = 961.66

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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.