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Finding the Fourth Proportional to 384.78, 530.96 and 227.40

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Solution

The fourth proportional to 384.78, 530.96 and 227.40 is: 313.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    384.78 : 530.96 = 227.40 : x
  2. Step 2: Convert to fraction form
    384.78/530.96 = 227.40/x
  3. Step 3: Cross multiply
    384.78x = 530.96 × 227.40
  4. Step 4: Simplify right side
    384.78x = 120,740.59
  5. Step 5: Solve for x
    x = 120,740.59/384.78
  6. Step 6: Final answer
    x = 313.80

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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.