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Finding the Fourth Proportional to 816.91, 1,127.35 and 443.90

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Solution

The fourth proportional to 816.91, 1,127.35 and 443.90 is: 612.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.91 : 1,127.35 = 443.90 : x
  2. Step 2: Convert to fraction form
    816.91/1,127.35 = 443.90/x
  3. Step 3: Cross multiply
    816.91x = 1,127.35 × 443.90
  4. Step 4: Simplify right side
    816.91x = 500,422.81
  5. Step 5: Solve for x
    x = 500,422.81/816.91
  6. Step 6: Final answer
    x = 612.58

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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.