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Finding the Fourth Proportional to 1,036.90, 1,431.42 and 664.44

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Solution

The fourth proportional to 1,036.90, 1,431.42 and 664.44 is: 917.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,036.90 : 1,431.42 = 664.44 : x
  2. Step 2: Convert to fraction form
    1,036.90/1,431.42 = 664.44/x
  3. Step 3: Cross multiply
    1,036.90x = 1,431.42 × 664.44
  4. Step 4: Simplify right side
    1,036.90x = 951,088.58
  5. Step 5: Solve for x
    x = 951,088.58/1,036.90
  6. Step 6: Final answer
    x = 917.24

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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.