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Finding the Fourth Proportional to 929.40, 1,392.90 and 826.20

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Solution

The fourth proportional to 929.40, 1,392.90 and 826.20 is: 1,238.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.40 : 1,392.90 = 826.20 : x
  2. Step 2: Convert to fraction form
    929.40/1,392.90 = 826.20/x
  3. Step 3: Cross multiply
    929.40x = 1,392.90 × 826.20
  4. Step 4: Simplify right side
    929.40x = 1,150,813.98
  5. Step 5: Solve for x
    x = 1,150,813.98/929.40
  6. Step 6: Final answer
    x = 1,238.23

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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.