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Finding the Fourth Proportional to 1,071.88, 1,606.60 and 811.02

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Solution

The fourth proportional to 1,071.88, 1,606.60 and 811.02 is: 1,215.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,071.88 : 1,606.60 = 811.02 : x
  2. Step 2: Convert to fraction form
    1,071.88/1,606.60 = 811.02/x
  3. Step 3: Cross multiply
    1,071.88x = 1,606.60 × 811.02
  4. Step 4: Simplify right side
    1,071.88x = 1,302,984.73
  5. Step 5: Solve for x
    x = 1,302,984.73/1,071.88
  6. Step 6: Final answer
    x = 1,215.61

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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.