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Finding the Fourth Proportional to 1,360.87, 1,878 and 829.76

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Solution

The fourth proportional to 1,360.87, 1,878 and 829.76 is: 1,145.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,360.87 : 1,878 = 829.76 : x
  2. Step 2: Convert to fraction form
    1,360.87/1,878 = 829.76/x
  3. Step 3: Cross multiply
    1,360.87x = 1,878 × 829.76
  4. Step 4: Simplify right side
    1,360.87x = 1,558,279.89
  5. Step 5: Solve for x
    x = 1,558,279.89/1,360.87
  6. Step 6: Final answer
    x = 1,145.06

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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.