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Finding the Fourth Proportional to 1,361.68, 1,879.10 and 740.68

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Solution

The fourth proportional to 1,361.68, 1,879.10 and 740.68 is: 1,022.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,361.68 : 1,879.10 = 740.68 : x
  2. Step 2: Convert to fraction form
    1,361.68/1,879.10 = 740.68/x
  3. Step 3: Cross multiply
    1,361.68x = 1,879.10 × 740.68
  4. Step 4: Simplify right side
    1,361.68x = 1,391,808.94
  5. Step 5: Solve for x
    x = 1,391,808.94/1,361.68
  6. Step 6: Final answer
    x = 1,022.13

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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.