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Finding the Fourth Proportional to 811.22, 1,210.91 and 751.04

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Solution

The fourth proportional to 811.22, 1,210.91 and 751.04 is: 1,121.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.22 : 1,210.91 = 751.04 : x
  2. Step 2: Convert to fraction form
    811.22/1,210.91 = 751.04/x
  3. Step 3: Cross multiply
    811.22x = 1,210.91 × 751.04
  4. Step 4: Simplify right side
    811.22x = 909,441.85
  5. Step 5: Solve for x
    x = 909,441.85/811.22
  6. Step 6: Final answer
    x = 1,121.08

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.