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Finding the Fourth Proportional to 460.20, 690.30 and 338.70

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Solution

The fourth proportional to 460.20, 690.30 and 338.70 is: 508.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    460.20 : 690.30 = 338.70 : x
  2. Step 2: Convert to fraction form
    460.20/690.30 = 338.70/x
  3. Step 3: Cross multiply
    460.20x = 690.30 × 338.70
  4. Step 4: Simplify right side
    460.20x = 233,804.61
  5. Step 5: Solve for x
    x = 233,804.61/460.20
  6. Step 6: Final answer
    x = 508.05

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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.