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Finding the Fourth Proportional to 889.86, 1,328.49 and 751.98

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Solution

The fourth proportional to 889.86, 1,328.49 and 751.98 is: 1,122.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.86 : 1,328.49 = 751.98 : x
  2. Step 2: Convert to fraction form
    889.86/1,328.49 = 751.98/x
  3. Step 3: Cross multiply
    889.86x = 1,328.49 × 751.98
  4. Step 4: Simplify right side
    889.86x = 998,997.91
  5. Step 5: Solve for x
    x = 998,997.91/889.86
  6. Step 6: Final answer
    x = 1,122.65

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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.