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Finding the Fourth Proportional to 1,361.08, 1,877 and 913.96

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Solution

The fourth proportional to 1,361.08, 1,877 and 913.96 is: 1,260.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,361.08 : 1,877 = 913.96 : x
  2. Step 2: Convert to fraction form
    1,361.08/1,877 = 913.96/x
  3. Step 3: Cross multiply
    1,361.08x = 1,877 × 913.96
  4. Step 4: Simplify right side
    1,361.08x = 1,715,502.92
  5. Step 5: Solve for x
    x = 1,715,502.92/1,361.08
  6. Step 6: Final answer
    x = 1,260.40

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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.