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Finding the Fourth Proportional to 1,360.68, 1,876.60 and 918.40

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Solution

The fourth proportional to 1,360.68, 1,876.60 and 918.40 is: 1,266.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,360.68 : 1,876.60 = 918.40 : x
  2. Step 2: Convert to fraction form
    1,360.68/1,876.60 = 918.40/x
  3. Step 3: Cross multiply
    1,360.68x = 1,876.60 × 918.40
  4. Step 4: Simplify right side
    1,360.68x = 1,723,469.44
  5. Step 5: Solve for x
    x = 1,723,469.44/1,360.68
  6. Step 6: Final answer
    x = 1,266.62

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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.