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Finding the Fourth Proportional to 1,291.77, 1,782.80 and 1,081.58

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Solution

The fourth proportional to 1,291.77, 1,782.80 and 1,081.58 is: 1,492.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.77 : 1,782.80 = 1,081.58 : x
  2. Step 2: Convert to fraction form
    1,291.77/1,782.80 = 1,081.58/x
  3. Step 3: Cross multiply
    1,291.77x = 1,782.80 × 1,081.58
  4. Step 4: Simplify right side
    1,291.77x = 1,928,226.50
  5. Step 5: Solve for x
    x = 1,928,226.50/1,291.77
  6. Step 6: Final answer
    x = 1,492.70

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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.