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Finding the Fourth Proportional to 811.72, 1,118.88 and 549.28

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Solution

The fourth proportional to 811.72, 1,118.88 and 549.28 is: 757.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.72 : 1,118.88 = 549.28 : x
  2. Step 2: Convert to fraction form
    811.72/1,118.88 = 549.28/x
  3. Step 3: Cross multiply
    811.72x = 1,118.88 × 549.28
  4. Step 4: Simplify right side
    811.72x = 614,578.41
  5. Step 5: Solve for x
    x = 614,578.41/811.72
  6. Step 6: Final answer
    x = 757.13

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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.