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Finding the Fourth Proportional to 256.50, 384.75 and 64.13

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Solution

The fourth proportional to 256.50, 384.75 and 64.13 is: 96.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.50 : 384.75 = 64.13 : x
  2. Step 2: Convert to fraction form
    256.50/384.75 = 64.13/x
  3. Step 3: Cross multiply
    256.50x = 384.75 × 64.13
  4. Step 4: Simplify right side
    256.50x = 24,674.02
  5. Step 5: Solve for x
    x = 24,674.02/256.50
  6. Step 6: Final answer
    x = 96.20

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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.