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Finding the Fourth Proportional to 431.98, 595.15 and 321.28

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Solution

The fourth proportional to 431.98, 595.15 and 321.28 is: 442.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.98 : 595.15 = 321.28 : x
  2. Step 2: Convert to fraction form
    431.98/595.15 = 321.28/x
  3. Step 3: Cross multiply
    431.98x = 595.15 × 321.28
  4. Step 4: Simplify right side
    431.98x = 191,207.50
  5. Step 5: Solve for x
    x = 191,207.50/431.98
  6. Step 6: Final answer
    x = 442.63

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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.