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Finding the Fourth Proportional to 926.20, 1,389.21 and 378.43

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Solution

The fourth proportional to 926.20, 1,389.21 and 378.43 is: 567.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.20 : 1,389.21 = 378.43 : x
  2. Step 2: Convert to fraction form
    926.20/1,389.21 = 378.43/x
  3. Step 3: Cross multiply
    926.20x = 1,389.21 × 378.43
  4. Step 4: Simplify right side
    926.20x = 525,718.74
  5. Step 5: Solve for x
    x = 525,718.74/926.20
  6. Step 6: Final answer
    x = 567.61

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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.