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Finding the Fourth Proportional to 256.02, 353.30 and 139.59

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Solution

The fourth proportional to 256.02, 353.30 and 139.59 is: 192.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.02 : 353.30 = 139.59 : x
  2. Step 2: Convert to fraction form
    256.02/353.30 = 139.59/x
  3. Step 3: Cross multiply
    256.02x = 353.30 × 139.59
  4. Step 4: Simplify right side
    256.02x = 49,315.38
  5. Step 5: Solve for x
    x = 49,315.38/256.02
  6. Step 6: Final answer
    x = 192.62

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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.