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Finding the Fourth Proportional to 1,391.27, 1,918.29 and 893.93

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Solution

The fourth proportional to 1,391.27, 1,918.29 and 893.93 is: 1,232.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.27 : 1,918.29 = 893.93 : x
  2. Step 2: Convert to fraction form
    1,391.27/1,918.29 = 893.93/x
  3. Step 3: Cross multiply
    1,391.27x = 1,918.29 × 893.93
  4. Step 4: Simplify right side
    1,391.27x = 1,714,807.39
  5. Step 5: Solve for x
    x = 1,714,807.39/1,391.27
  6. Step 6: Final answer
    x = 1,232.55

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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.