Home / 1,261.50-1,890.98-611.88

Finding the Fourth Proportional to 1,261.50, 1,890.98 and 611.88

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Solution

The fourth proportional to 1,261.50, 1,890.98 and 611.88 is: 917.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.50 : 1,890.98 = 611.88 : x
  2. Step 2: Convert to fraction form
    1,261.50/1,890.98 = 611.88/x
  3. Step 3: Cross multiply
    1,261.50x = 1,890.98 × 611.88
  4. Step 4: Simplify right side
    1,261.50x = 1,157,052.84
  5. Step 5: Solve for x
    x = 1,157,052.84/1,261.50
  6. Step 6: Final answer
    x = 917.20

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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.