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Finding the Fourth Proportional to 1,257.81, 1,887.93 and 948.60

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Solution

The fourth proportional to 1,257.81, 1,887.93 and 948.60 is: 1,423.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,257.81 : 1,887.93 = 948.60 : x
  2. Step 2: Convert to fraction form
    1,257.81/1,887.93 = 948.60/x
  3. Step 3: Cross multiply
    1,257.81x = 1,887.93 × 948.60
  4. Step 4: Simplify right side
    1,257.81x = 1,790,890.40
  5. Step 5: Solve for x
    x = 1,790,890.40/1,257.81
  6. Step 6: Final answer
    x = 1,423.82

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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.