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Finding the Fourth Proportional to 1,191.44, 1,642.80 and 837.68

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Solution

The fourth proportional to 1,191.44, 1,642.80 and 837.68 is: 1,155.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.44 : 1,642.80 = 837.68 : x
  2. Step 2: Convert to fraction form
    1,191.44/1,642.80 = 837.68/x
  3. Step 3: Cross multiply
    1,191.44x = 1,642.80 × 837.68
  4. Step 4: Simplify right side
    1,191.44x = 1,376,140.70
  5. Step 5: Solve for x
    x = 1,376,140.70/1,191.44
  6. Step 6: Final answer
    x = 1,155.02

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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.