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Finding the Fourth Proportional to 1,291.96, 1,781.94 and 1,117

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Solution

The fourth proportional to 1,291.96, 1,781.94 and 1,117 is: 1,540.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.96 : 1,781.94 = 1,117 : x
  2. Step 2: Convert to fraction form
    1,291.96/1,781.94 = 1,117/x
  3. Step 3: Cross multiply
    1,291.96x = 1,781.94 × 1,117
  4. Step 4: Simplify right side
    1,291.96x = 1,990,426.98
  5. Step 5: Solve for x
    x = 1,990,426.98/1,291.96
  6. Step 6: Final answer
    x = 1,540.63

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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.