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Finding the Fourth Proportional to 926.70, 1,388.43 and 772.80

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Solution

The fourth proportional to 926.70, 1,388.43 and 772.80 is: 1,157.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.70 : 1,388.43 = 772.80 : x
  2. Step 2: Convert to fraction form
    926.70/1,388.43 = 772.80/x
  3. Step 3: Cross multiply
    926.70x = 1,388.43 × 772.80
  4. Step 4: Simplify right side
    926.70x = 1,072,978.70
  5. Step 5: Solve for x
    x = 1,072,978.70/926.70
  6. Step 6: Final answer
    x = 1,157.85

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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.