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Finding the Fourth Proportional to 1,257.50, 1,885.84 and 911.63

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Solution

The fourth proportional to 1,257.50, 1,885.84 and 911.63 is: 1,367.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,257.50 : 1,885.84 = 911.63 : x
  2. Step 2: Convert to fraction form
    1,257.50/1,885.84 = 911.63/x
  3. Step 3: Cross multiply
    1,257.50x = 1,885.84 × 911.63
  4. Step 4: Simplify right side
    1,257.50x = 1,719,190.75
  5. Step 5: Solve for x
    x = 1,719,190.75/1,257.50
  6. Step 6: Final answer
    x = 1,367.15

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1.5x scale

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.