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Finding the Fourth Proportional to 1,071.25, 1,607.42 and 811.16

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Solution

The fourth proportional to 1,071.25, 1,607.42 and 811.16 is: 1,217.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,071.25 : 1,607.42 = 811.16 : x
  2. Step 2: Convert to fraction form
    1,071.25/1,607.42 = 811.16/x
  3. Step 3: Cross multiply
    1,071.25x = 1,607.42 × 811.16
  4. Step 4: Simplify right side
    1,071.25x = 1,303,874.83
  5. Step 5: Solve for x
    x = 1,303,874.83/1,071.25
  6. Step 6: Final answer
    x = 1,217.16

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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.