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Finding the Fourth Proportional to 926.90, 1,278.86 and 533.86

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Solution

The fourth proportional to 926.90, 1,278.86 and 533.86 is: 736.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.90 : 1,278.86 = 533.86 : x
  2. Step 2: Convert to fraction form
    926.90/1,278.86 = 533.86/x
  3. Step 3: Cross multiply
    926.90x = 1,278.86 × 533.86
  4. Step 4: Simplify right side
    926.90x = 682,732.20
  5. Step 5: Solve for x
    x = 682,732.20/926.90
  6. Step 6: Final answer
    x = 736.58

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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.