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Finding the Fourth Proportional to 431.45, 595.40 and 256.80

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Solution

The fourth proportional to 431.45, 595.40 and 256.80 is: 354.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.45 : 595.40 = 256.80 : x
  2. Step 2: Convert to fraction form
    431.45/595.40 = 256.80/x
  3. Step 3: Cross multiply
    431.45x = 595.40 × 256.80
  4. Step 4: Simplify right side
    431.45x = 152,898.72
  5. Step 5: Solve for x
    x = 152,898.72/431.45
  6. Step 6: Final answer
    x = 354.38

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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.