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Finding the Fourth Proportional to 1,261.08, 1,739.80 and 763.72

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Solution

The fourth proportional to 1,261.08, 1,739.80 and 763.72 is: 1,053.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.08 : 1,739.80 = 763.72 : x
  2. Step 2: Convert to fraction form
    1,261.08/1,739.80 = 763.72/x
  3. Step 3: Cross multiply
    1,261.08x = 1,739.80 × 763.72
  4. Step 4: Simplify right side
    1,261.08x = 1,328,720.06
  5. Step 5: Solve for x
    x = 1,328,720.06/1,261.08
  6. Step 6: Final answer
    x = 1,053.64

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.