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Finding the Fourth Proportional to 751.51, 1,121.95 and 673.21

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Solution

The fourth proportional to 751.51, 1,121.95 and 673.21 is: 1,005.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.51 : 1,121.95 = 673.21 : x
  2. Step 2: Convert to fraction form
    751.51/1,121.95 = 673.21/x
  3. Step 3: Cross multiply
    751.51x = 1,121.95 × 673.21
  4. Step 4: Simplify right side
    751.51x = 755,307.96
  5. Step 5: Solve for x
    x = 755,307.96/751.51
  6. Step 6: Final answer
    x = 1,005.05

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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.