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Finding the Fourth Proportional to 889.22, 1,331.55 and 657.77

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Solution

The fourth proportional to 889.22, 1,331.55 and 657.77 is: 984.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.22 : 1,331.55 = 657.77 : x
  2. Step 2: Convert to fraction form
    889.22/1,331.55 = 657.77/x
  3. Step 3: Cross multiply
    889.22x = 1,331.55 × 657.77
  4. Step 4: Simplify right side
    889.22x = 875,846.99
  5. Step 5: Solve for x
    x = 875,846.99/889.22
  6. Step 6: Final answer
    x = 984.96

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.