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Finding the Fourth Proportional to 810.66, 1,118.90 and 496.18

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Solution

The fourth proportional to 810.66, 1,118.90 and 496.18 is: 684.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.66 : 1,118.90 = 496.18 : x
  2. Step 2: Convert to fraction form
    810.66/1,118.90 = 496.18/x
  3. Step 3: Cross multiply
    810.66x = 1,118.90 × 496.18
  4. Step 4: Simplify right side
    810.66x = 555,175.80
  5. Step 5: Solve for x
    x = 555,175.80/810.66
  6. Step 6: Final answer
    x = 684.84

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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.