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Finding the Fourth Proportional to 384.50, 530.57 and 218.70

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Solution

The fourth proportional to 384.50, 530.57 and 218.70 is: 301.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    384.50 : 530.57 = 218.70 : x
  2. Step 2: Convert to fraction form
    384.50/530.57 = 218.70/x
  3. Step 3: Cross multiply
    384.50x = 530.57 × 218.70
  4. Step 4: Simplify right side
    384.50x = 116,036.21
  5. Step 5: Solve for x
    x = 116,036.21/384.50
  6. Step 6: Final answer
    x = 301.78

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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.