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Finding the Fourth Proportional to 811.88, 1,118.76 and 671.60

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Solution

The fourth proportional to 811.88, 1,118.76 and 671.60 is: 925.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.88 : 1,118.76 = 671.60 : x
  2. Step 2: Convert to fraction form
    811.88/1,118.76 = 671.60/x
  3. Step 3: Cross multiply
    811.88x = 1,118.76 × 671.60
  4. Step 4: Simplify right side
    811.88x = 751,359.22
  5. Step 5: Solve for x
    x = 751,359.22/811.88
  6. Step 6: Final answer
    x = 925.46

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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.