Home / 1,261.66-1,890.39-439.48

Finding the Fourth Proportional to 1,261.66, 1,890.39 and 439.48

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Solution

The fourth proportional to 1,261.66, 1,890.39 and 439.48 is: 658.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.66 : 1,890.39 = 439.48 : x
  2. Step 2: Convert to fraction form
    1,261.66/1,890.39 = 439.48/x
  3. Step 3: Cross multiply
    1,261.66x = 1,890.39 × 439.48
  4. Step 4: Simplify right side
    1,261.66x = 830,788.60
  5. Step 5: Solve for x
    x = 830,788.60/1,261.66
  6. Step 6: Final answer
    x = 658.49

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Double scale
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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.