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Finding the Fourth Proportional to 1,360.80, 1,878.09 and 989.01

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Solution

The fourth proportional to 1,360.80, 1,878.09 and 989.01 is: 1,364.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,360.80 : 1,878.09 = 989.01 : x
  2. Step 2: Convert to fraction form
    1,360.80/1,878.09 = 989.01/x
  3. Step 3: Cross multiply
    1,360.80x = 1,878.09 × 989.01
  4. Step 4: Simplify right side
    1,360.80x = 1,857,446.08
  5. Step 5: Solve for x
    x = 1,857,446.08/1,360.80
  6. Step 6: Final answer
    x = 1,364.97

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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.