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Finding the Fourth Proportional to 1,272.63, 1,755 and 992.77

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Solution

The fourth proportional to 1,272.63, 1,755 and 992.77 is: 1,369.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.63 : 1,755 = 992.77 : x
  2. Step 2: Convert to fraction form
    1,272.63/1,755 = 992.77/x
  3. Step 3: Cross multiply
    1,272.63x = 1,755 × 992.77
  4. Step 4: Simplify right side
    1,272.63x = 1,742,306.96
  5. Step 5: Solve for x
    x = 1,742,306.96/1,272.63
  6. Step 6: Final answer
    x = 1,369.06

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Double scale
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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.