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Finding the Fourth Proportional to 811.58, 1,118.44 and 651.87

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Solution

The fourth proportional to 811.58, 1,118.44 and 651.87 is: 898.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.58 : 1,118.44 = 651.87 : x
  2. Step 2: Convert to fraction form
    811.58/1,118.44 = 651.87/x
  3. Step 3: Cross multiply
    811.58x = 1,118.44 × 651.87
  4. Step 4: Simplify right side
    811.58x = 729,078.30
  5. Step 5: Solve for x
    x = 729,078.30/811.58
  6. Step 6: Final answer
    x = 898.35

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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.