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Finding the Fourth Proportional to 1,291.07, 1,781.69 and 701.61

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Solution

The fourth proportional to 1,291.07, 1,781.69 and 701.61 is: 968.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.07 : 1,781.69 = 701.61 : x
  2. Step 2: Convert to fraction form
    1,291.07/1,781.69 = 701.61/x
  3. Step 3: Cross multiply
    1,291.07x = 1,781.69 × 701.61
  4. Step 4: Simplify right side
    1,291.07x = 1,250,051.52
  5. Step 5: Solve for x
    x = 1,250,051.52/1,291.07
  6. Step 6: Final answer
    x = 968.23

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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.