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Finding the Fourth Proportional to 1,143.55, 1,714.99 and 485.42

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Solution

The fourth proportional to 1,143.55, 1,714.99 and 485.42 is: 727.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,143.55 : 1,714.99 = 485.42 : x
  2. Step 2: Convert to fraction form
    1,143.55/1,714.99 = 485.42/x
  3. Step 3: Cross multiply
    1,143.55x = 1,714.99 × 485.42
  4. Step 4: Simplify right side
    1,143.55x = 832,479.44
  5. Step 5: Solve for x
    x = 832,479.44/1,143.55
  6. Step 6: Final answer
    x = 727.98

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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.