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Finding the Fourth Proportional to 256.09, 353.40 and 139.65

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Solution

The fourth proportional to 256.09, 353.40 and 139.65 is: 192.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.09 : 353.40 = 139.65 : x
  2. Step 2: Convert to fraction form
    256.09/353.40 = 139.65/x
  3. Step 3: Cross multiply
    256.09x = 353.40 × 139.65
  4. Step 4: Simplify right side
    256.09x = 49,353.19
  5. Step 5: Solve for x
    x = 49,353.19/256.09
  6. Step 6: Final answer
    x = 192.72

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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.