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Finding the Fourth Proportional to 256.15, 357.80 and 256.15

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Solution

The fourth proportional to 256.15, 357.80 and 256.15 is: 357.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.15 : 357.80 = 256.15 : x
  2. Step 2: Convert to fraction form
    256.15/357.80 = 256.15/x
  3. Step 3: Cross multiply
    256.15x = 357.80 × 256.15
  4. Step 4: Simplify right side
    256.15x = 91,650.47
  5. Step 5: Solve for x
    x = 91,650.47/256.15
  6. Step 6: Final answer
    x = 357.80

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.