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Finding the Fourth Proportional to 890.24, 1,328 and 786.56

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Solution

The fourth proportional to 890.24, 1,328 and 786.56 is: 1,173.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.24 : 1,328 = 786.56 : x
  2. Step 2: Convert to fraction form
    890.24/1,328 = 786.56/x
  3. Step 3: Cross multiply
    890.24x = 1,328 × 786.56
  4. Step 4: Simplify right side
    890.24x = 1,044,551.68
  5. Step 5: Solve for x
    x = 1,044,551.68/890.24
  6. Step 6: Final answer
    x = 1,173.34

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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.