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Finding the Fourth Proportional to 751.61, 1,121.98 and 649.55

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Solution

The fourth proportional to 751.61, 1,121.98 and 649.55 is: 969.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.61 : 1,121.98 = 649.55 : x
  2. Step 2: Convert to fraction form
    751.61/1,121.98 = 649.55/x
  3. Step 3: Cross multiply
    751.61x = 1,121.98 × 649.55
  4. Step 4: Simplify right side
    751.61x = 728,782.11
  5. Step 5: Solve for x
    x = 728,782.11/751.61
  6. Step 6: Final answer
    x = 969.63

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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.