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Finding the Fourth Proportional to 847.46, 1,272.86 and 811.01

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Solution

The fourth proportional to 847.46, 1,272.86 and 811.01 is: 1,218.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    847.46 : 1,272.86 = 811.01 : x
  2. Step 2: Convert to fraction form
    847.46/1,272.86 = 811.01/x
  3. Step 3: Cross multiply
    847.46x = 1,272.86 × 811.01
  4. Step 4: Simplify right side
    847.46x = 1,032,299.58
  5. Step 5: Solve for x
    x = 1,032,299.58/847.46
  6. Step 6: Final answer
    x = 1,218.11

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.