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Finding the Fourth Proportional to 384.22, 530.15 and 218.40

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Solution

The fourth proportional to 384.22, 530.15 and 218.40 is: 301.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    384.22 : 530.15 = 218.40 : x
  2. Step 2: Convert to fraction form
    384.22/530.15 = 218.40/x
  3. Step 3: Cross multiply
    384.22x = 530.15 × 218.40
  4. Step 4: Simplify right side
    384.22x = 115,781.68
  5. Step 5: Solve for x
    x = 115,781.68/384.22
  6. Step 6: Final answer
    x = 301.34

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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.