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Finding the Fourth Proportional to 1,107.02, 1,661.73 and 458.21

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Solution

The fourth proportional to 1,107.02, 1,661.73 and 458.21 is: 687.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,107.02 : 1,661.73 = 458.21 : x
  2. Step 2: Convert to fraction form
    1,107.02/1,661.73 = 458.21/x
  3. Step 3: Cross multiply
    1,107.02x = 1,661.73 × 458.21
  4. Step 4: Simplify right side
    1,107.02x = 761,421.30
  5. Step 5: Solve for x
    x = 761,421.30/1,107.02
  6. Step 6: Final answer
    x = 687.81

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.