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Finding the Fourth Proportional to 928.76, 1,393.40 and 826.76

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Solution

The fourth proportional to 928.76, 1,393.40 and 826.76 is: 1,240.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.76 : 1,393.40 = 826.76 : x
  2. Step 2: Convert to fraction form
    928.76/1,393.40 = 826.76/x
  3. Step 3: Cross multiply
    928.76x = 1,393.40 × 826.76
  4. Step 4: Simplify right side
    928.76x = 1,152,007.49
  5. Step 5: Solve for x
    x = 1,152,007.49/928.76
  6. Step 6: Final answer
    x = 1,240.37

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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.