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Finding the Fourth Proportional to 934.36, 1,288.34 and 619.88

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Solution

The fourth proportional to 934.36, 1,288.34 and 619.88 is: 854.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    934.36 : 1,288.34 = 619.88 : x
  2. Step 2: Convert to fraction form
    934.36/1,288.34 = 619.88/x
  3. Step 3: Cross multiply
    934.36x = 1,288.34 × 619.88
  4. Step 4: Simplify right side
    934.36x = 798,616.20
  5. Step 5: Solve for x
    x = 798,616.20/934.36
  6. Step 6: Final answer
    x = 854.72

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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.