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Finding the Fourth Proportional to 1,261.06, 1,891.05 and 439.09

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Solution

The fourth proportional to 1,261.06, 1,891.05 and 439.09 is: 658.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.06 : 1,891.05 = 439.09 : x
  2. Step 2: Convert to fraction form
    1,261.06/1,891.05 = 439.09/x
  3. Step 3: Cross multiply
    1,261.06x = 1,891.05 × 439.09
  4. Step 4: Simplify right side
    1,261.06x = 830,341.14
  5. Step 5: Solve for x
    x = 830,341.14/1,261.06
  6. Step 6: Final answer
    x = 658.45

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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.