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Finding the Fourth Proportional to 256.50, 384.76 and 64.12

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Solution

The fourth proportional to 256.50, 384.76 and 64.12 is: 96.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.50 : 384.76 = 64.12 : x
  2. Step 2: Convert to fraction form
    256.50/384.76 = 64.12/x
  3. Step 3: Cross multiply
    256.50x = 384.76 × 64.12
  4. Step 4: Simplify right side
    256.50x = 24,670.81
  5. Step 5: Solve for x
    x = 24,670.81/256.50
  6. Step 6: Final answer
    x = 96.18

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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.