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Finding the Fourth Proportional to 460.72, 635.34 and 390.70

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Solution

The fourth proportional to 460.72, 635.34 and 390.70 is: 538.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    460.72 : 635.34 = 390.70 : x
  2. Step 2: Convert to fraction form
    460.72/635.34 = 390.70/x
  3. Step 3: Cross multiply
    460.72x = 635.34 × 390.70
  4. Step 4: Simplify right side
    460.72x = 248,227.34
  5. Step 5: Solve for x
    x = 248,227.34/460.72
  6. Step 6: Final answer
    x = 538.78

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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.