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Finding the Fourth Proportional to 1,261.80, 1,742.64 and 985.32

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Solution

The fourth proportional to 1,261.80, 1,742.64 and 985.32 is: 1,360.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.80 : 1,742.64 = 985.32 : x
  2. Step 2: Convert to fraction form
    1,261.80/1,742.64 = 985.32/x
  3. Step 3: Cross multiply
    1,261.80x = 1,742.64 × 985.32
  4. Step 4: Simplify right side
    1,261.80x = 1,717,058.04
  5. Step 5: Solve for x
    x = 1,717,058.04/1,261.80
  6. Step 6: Final answer
    x = 1,360.80

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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.