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Finding the Fourth Proportional to 384.43, 530.47 and 218.60

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Solution

The fourth proportional to 384.43, 530.47 and 218.60 is: 301.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    384.43 : 530.47 = 218.60 : x
  2. Step 2: Convert to fraction form
    384.43/530.47 = 218.60/x
  3. Step 3: Cross multiply
    384.43x = 530.47 × 218.60
  4. Step 4: Simplify right side
    384.43x = 115,960.74
  5. Step 5: Solve for x
    x = 115,960.74/384.43
  6. Step 6: Final answer
    x = 301.64

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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.