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Finding the Fourth Proportional to 1,390.97, 1,918.43 and 893.66

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Solution

The fourth proportional to 1,390.97, 1,918.43 and 893.66 is: 1,232.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.97 : 1,918.43 = 893.66 : x
  2. Step 2: Convert to fraction form
    1,390.97/1,918.43 = 893.66/x
  3. Step 3: Cross multiply
    1,390.97x = 1,918.43 × 893.66
  4. Step 4: Simplify right side
    1,390.97x = 1,714,424.15
  5. Step 5: Solve for x
    x = 1,714,424.15/1,390.97
  6. Step 6: Final answer
    x = 1,232.54

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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.