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Finding the Fourth Proportional to 934.74, 1,288.99 and 619.90

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Solution

The fourth proportional to 934.74, 1,288.99 and 619.90 is: 854.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    934.74 : 1,288.99 = 619.90 : x
  2. Step 2: Convert to fraction form
    934.74/1,288.99 = 619.90/x
  3. Step 3: Cross multiply
    934.74x = 1,288.99 × 619.90
  4. Step 4: Simplify right side
    934.74x = 799,042.45
  5. Step 5: Solve for x
    x = 799,042.45/934.74
  6. Step 6: Final answer
    x = 854.83

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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.