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Finding the Fourth Proportional to 431.70, 595.40 and 256.88

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Solution

The fourth proportional to 431.70, 595.40 and 256.88 is: 354.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.70 : 595.40 = 256.88 : x
  2. Step 2: Convert to fraction form
    431.70/595.40 = 256.88/x
  3. Step 3: Cross multiply
    431.70x = 595.40 × 256.88
  4. Step 4: Simplify right side
    431.70x = 152,942.09
  5. Step 5: Solve for x
    x = 152,942.09/431.70
  6. Step 6: Final answer
    x = 354.28

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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.