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Finding the Fourth Proportional to 256.46, 384.58 and 139.22

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Solution

The fourth proportional to 256.46, 384.58 and 139.22 is: 208.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.46 : 384.58 = 139.22 : x
  2. Step 2: Convert to fraction form
    256.46/384.58 = 139.22/x
  3. Step 3: Cross multiply
    256.46x = 384.58 × 139.22
  4. Step 4: Simplify right side
    256.46x = 53,541.23
  5. Step 5: Solve for x
    x = 53,541.23/256.46
  6. Step 6: Final answer
    x = 208.77

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.