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Finding the Fourth Proportional to 926.97, 1,390.43 and 619.41

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Solution

The fourth proportional to 926.97, 1,390.43 and 619.41 is: 929.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.97 : 1,390.43 = 619.41 : x
  2. Step 2: Convert to fraction form
    926.97/1,390.43 = 619.41/x
  3. Step 3: Cross multiply
    926.97x = 1,390.43 × 619.41
  4. Step 4: Simplify right side
    926.97x = 861,243.15
  5. Step 5: Solve for x
    x = 861,243.15/926.97
  6. Step 6: Final answer
    x = 929.09

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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.