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Finding the Fourth Proportional to 889.49, 1,226.26 and 557.69

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Solution

The fourth proportional to 889.49, 1,226.26 and 557.69 is: 768.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.49 : 1,226.26 = 557.69 : x
  2. Step 2: Convert to fraction form
    889.49/1,226.26 = 557.69/x
  3. Step 3: Cross multiply
    889.49x = 1,226.26 × 557.69
  4. Step 4: Simplify right side
    889.49x = 683,874.61
  5. Step 5: Solve for x
    x = 683,874.61/889.49
  6. Step 6: Final answer
    x = 768.84

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.