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Finding the Fourth Proportional to 772.06, 1,158.08 and 338.91

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Solution

The fourth proportional to 772.06, 1,158.08 and 338.91 is: 508.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.06 : 1,158.08 = 338.91 : x
  2. Step 2: Convert to fraction form
    772.06/1,158.08 = 338.91/x
  3. Step 3: Cross multiply
    772.06x = 1,158.08 × 338.91
  4. Step 4: Simplify right side
    772.06x = 392,485.74
  5. Step 5: Solve for x
    x = 392,485.74/772.06
  6. Step 6: Final answer
    x = 508.36

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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.