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Finding the Fourth Proportional to 751.50, 1,121.51 and 669.48

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Solution

The fourth proportional to 751.50, 1,121.51 and 669.48 is: 999.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.50 : 1,121.51 = 669.48 : x
  2. Step 2: Convert to fraction form
    751.50/1,121.51 = 669.48/x
  3. Step 3: Cross multiply
    751.50x = 1,121.51 × 669.48
  4. Step 4: Simplify right side
    751.50x = 750,825.17
  5. Step 5: Solve for x
    x = 750,825.17/751.50
  6. Step 6: Final answer
    x = 999.10

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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.