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Finding the Fourth Proportional to 1,005.44, 1,507.15 and 485.29

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Solution

The fourth proportional to 1,005.44, 1,507.15 and 485.29 is: 727.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,005.44 : 1,507.15 = 485.29 : x
  2. Step 2: Convert to fraction form
    1,005.44/1,507.15 = 485.29/x
  3. Step 3: Cross multiply
    1,005.44x = 1,507.15 × 485.29
  4. Step 4: Simplify right side
    1,005.44x = 731,394.86
  5. Step 5: Solve for x
    x = 731,394.86/1,005.44
  6. Step 6: Final answer
    x = 727.44

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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.