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Finding the Fourth Proportional to 928.90, 1,280.89 and 663.37

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Solution

The fourth proportional to 928.90, 1,280.89 and 663.37 is: 914.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.90 : 1,280.89 = 663.37 : x
  2. Step 2: Convert to fraction form
    928.90/1,280.89 = 663.37/x
  3. Step 3: Cross multiply
    928.90x = 1,280.89 × 663.37
  4. Step 4: Simplify right side
    928.90x = 849,704.00
  5. Step 5: Solve for x
    x = 849,704.00/928.90
  6. Step 6: Final answer
    x = 914.74

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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.